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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2014	May 02, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Trading Symbol	EVOK
Entity Registrant Name	Evoke Pharma Inc
Entity Central Index Key	0001403708
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		6,099,547

Condensed Balance Sheets - USD ($)	Mar. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 21,835,498	$ 24,196,691
Prepaid expenses	176,247	234,262
Total current assets	22,011,745	24,430,953
Other assets	555,505	555,505
Total assets	22,567,250	24,986,458
Current Liabilities:
Accounts payable and accrued expenses	1,115,853	284,915
Accrued compensation	385,499	557,399
Current portion of long-term debt	1,442,592	1,442,592
Total current liabilities	2,943,944	2,284,906
Deferred rent expense	15,518	6,830
Long-term debt, net of current portion	1,156,701	1,511,461
Total liabilities	4,116,163	3,803,197
Stockholders' equity:
Common stock, $0.0001 par value; authorized shares - 50,000,000; issued and outstanding shares - 6,099,547 at March 31, 2014 and 6,096,752 at December 31, 2013	610	610
Additional paid-in capital	44,097,429	43,874,119
Deficit accumulated during the development stage	(25,646,952)	(22,691,468)
Total stockholders' equity	18,451,087	21,183,261
Total liabilities and stockholders' equity	$ 22,567,250	$ 24,986,458

Condensed Statements of Operations and Comprehensive Loss - USD ($)	3 Months Ended		86 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014
Operating expenses:
Research and development	$ 1,852,116	$ 110,981	$ 18,800,625
General and administrative	1,070,479	221,049	6,019,860
Purchase of in-process research and development			650,000
Total operating expenses	2,922,595	332,030	25,470,485
Loss from operations	(2,922,595)	(332,030)	(25,470,485)
Other income (expense):
Interest income	4,055	1,353	225,155
Interest expense	(36,944)	(39,315)	(402,771)
Change in fair value of preferred stock purchase right			(188,587)
Change in fair value of warrant liability		(124,000)	(54,264)
Grant income			244,000
Total other income (expense)	(32,889)	(161,962)	(176,467)
Net loss and comprehensive loss	$ (2,955,484)	$ (493,992)	$ (25,646,952)
Net loss per common share, basic and diluted	$ (0.49)	$ (0.44)
Weighted-average shares used to compute basic and diluted net loss per share	6,002,936	1,133,375

Condensed Statements of Cash Flows - USD ($)	3 Months Ended		86 Months Ended
Condensed Statements of Cash Flows - USD ($)	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014
Operating activities
Net loss	$ (2,955,484)	$ (493,992)	$ (25,646,952)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation expense	223,310	3,126	458,987
Non-cash interest	5,816	5,815	135,143
Change in fair value of purchase right liability			188,587
Change in fair value of warrant liability		124,000	54,264
Deferred rent expense	8,688		15,518
Changes in operating assets and liabilities:
Prepaid expenses	58,015	(10,500)	(176,247)
Other assets			(555,505)
Accounts payable and accrued expenses	659,038	(74,944)	1,501,352
Net cash used in operating activities	(2,000,617)	(446,495)	(24,024,853)
Financing activities
Proceeds from convertible promissory note			250,000
Proceeds from bank line of credit and loan advances		2,000,000	5,500,000
Payments on bank line of credit	(360,576)		(2,860,576)
Proceeds from issuance of common stock, net			25,125,528
Proceeds from issuance of preferred stock and purchase rights, net			17,744,041
Proceeds from exercise of stock options			101,358
Net cash provided by (used in) financing activities	(360,576)	2,000,000	45,860,351
Net increase (decrease) in cash and cash equivalents	(2,361,193)	1,553,505	21,835,498
Cash and cash equivalents at beginning of the period	24,196,691	116,013
Cash and cash equivalents at end of the period	21,835,498	1,669,518	21,835,498
Supplemental disclosures of cash flow information
Interest paid	$ 32,495	$ 25,750	261,246
Supplemental disclosures of non-cash financing information
Conversion of convertible promissory note and accrued interest to Series A Convertible Preferred Stock			$ 292,538
Issuance of Series A Convertible Preferred Stock warrants		49,000	108,486
Conversion of Series A Convertible Preferred Stock to Common Stock at the initial public offering			$ 18,225,166

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

The accompanying interim condensed financial statements are unaudited. These unaudited interim financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and following the requirements of the U.S. Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by GAAP can be condensed or omitted. In management’s opinion, the unaudited interim financial statements have been prepared on the same basis as the audited financial statements and include all adjustments, which include only normal recurring adjustments, necessary for the fair presentation of the Company’s financial position and its results of operations and comprehensive loss and its cash flows for the periods presented. These statements do not include all disclosures required by GAAP and should be read in conjunction with the Company’s financial statements and accompanying notes for the fiscal year ended December 31, 2013, which is contained in the Company’s Annual Report on Form 10-K filed with the SEC on March 25, 2014. The results for interim periods are not necessarily indicative of the results expected for the full fiscal year or any other interim period.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period. Actual results could differ from those estimates.

Stock-Based Compensation

Stock-based compensation expense for stock option grants and employee stock purchase plan shares is recorded at the estimated fair value of the award as of the grant date and is recognized as expense on a straight-line basis over the requisite service period of the stock-based award. The estimation of stock option and employee stock purchase plan fair value requires management to make estimates and judgments about, among other things, employee exercise behavior, forfeiture rates and volatility of the Company’s common stock. The judgments directly affect the amount of compensation expense that will be recognized.

Research and Development Expenses

Research and development costs are expensed as incurred and primarily include compensation and related benefits, stock-based compensation expense, costs paid to third-party contractors to perform research, conduct clinical trials and develop drug materials and delivery devices. The Company expenses costs relating to the purchase and production of pre-approval product inventories as research and development expense in the period incurred until U.S. Food and Drug Administration (“FDA”) approval is received.

The Company bases its expense accruals related to clinical studies on estimates of the services received and efforts expended pursuant to contracts with multiple research institutions and clinical research organizations that conduct and manage clinical studies on its behalf. The financial terms of these agreements vary from contract to contract and may result in uneven payment flows. Payments under some of these contracts depend on factors, such as the successful enrollment of patients, site initiation and the completion of clinical study milestones. Service providers typically invoice the Company monthly in arrears for services performed. In accruing service fees, the Company estimates the time period over which services will be performed and the level of effort to be expended in each period. If the Company does not identify costs that have begun to be incurred, or if the Company underestimates or overestimates the level of services performed or the costs of these services, actual expenses could differ from estimates. To date, the Company has not experienced significant changes in estimates of accrued research and development expenses after a reporting period. However, due to the nature of estimates, no assurance can be made that changes to the estimates will not be made in the future as the Company becomes aware of additional information about the status or conduct of clinical studies and other research activities.

The Company does not own or operate manufacturing facilities for the production of EVK-001, nor does it plan to develop its own manufacturing operations in the foreseeable future. The Company currently depends on third-party contract manufacturers for all of its required raw materials, drug substance and finished product for its preclinical research and clinical trials. The Company does not have any current contractual relationships for the manufacture of commercial supplies of EVK-001. If EVK-001 is approved by any regulatory agency, the Company intends to enter into agreements with third-party contract manufacturers for the commercial production at that time. The Company currently utilizes a third-party consultant, which it engages on an as-needed, hourly basis, to manage its manufacturing contractors.

Net Loss Per Share

Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares outstanding for the period, without consideration for common stock equivalents and adjusted for the weighted-average number of common shares outstanding that are subject to repurchase. The Company has excluded 94,375 and 109,375 weighted-average shares subject to repurchase from the weighted-average number of common shares outstanding for the three months ended March 31, 2014 and 2013, respectively. Diluted net loss per share is calculated by dividing the net loss by the weighted-average number of common share equivalents outstanding for the period determined using the treasury-stock method. Dilutive common stock equivalents are comprised of convertible preferred stock, warrants for the purchase of convertible preferred stock, warrants for the purchase of common stock, options outstanding under the Company’s equity incentive plans and potential shares to be purchased under the Company’s employee stock purchase plan. For the periods presented, there is no difference in the number of shares used to calculate basic and diluted shares outstanding due to the Company’s net loss position.

The following table summarizes the weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share (in common equivalent shares):


	Three Months Ended March 31,
	2014		2013

Convertible preferred stock outstanding		—		2,439,002
Warrants for convertible preferred stock		—		22,000
Warrants for common stock		96,000		—
Common stock options		634,750		123,250
Employee stock purchase plan		1,340		—

		732,090		2,584,252

Recent Accounting Pronouncements

During the quarter ended March 31, 2014, there were no new accounting pronouncements or updates to recently issued accounting pronouncements disclosed in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013 that affect the Company’s results of operations, financial condition, liquidity or disclosures.

Acquisition of Technology

3 Months Ended

Mar. 31, 2014

Business Combinations [Abstract]

Acquisition of Technology

4. Acquisition of Technology

In June 2007, the Company purchased from Questcor Pharmaceuticals, Inc. (“Questcor”) all rights and patents to a development program for the Company’s EVK-001 product candidate for an upfront payment of $650,000, which was expensed as in-process research and development. In May 2014, the Company will pay a milestone payment of $500,000 to Questcor based upon the initiation of the first patient dosing in its Phase 3 clinical trial for EVK-001. In addition to these payments, the Company may be required to make additional milestone payments totaling up to $51.5 million. These milestones include up to $4.5 million in payments if EVK-001 achieves the following development targets:

•

$1.5 million upon the FDA’s acceptance for review of a new drug application for EVK-001; and

•

$3 million upon the FDA’s approval of EVK-001.

The remaining $47 million in milestone payments depend on EVK-001’s commercial success and will only apply if EVK-001 receives regulatory approval. In addition, the Company will be required to pay to Questcor a low single digit royalty on net sales of EVK-001. The Company’s obligation to pay such royalties will terminate upon the expiration of the last patent right covering EVK-001, which is expected to occur in 2030.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Stockholders' Equity

3 Months Ended

Mar. 31, 2014

Equity [Abstract]

Stockholders' Equity

5. Stockholders’ Equity

Stock-Based Compensation

Stock-based compensation expense includes charges related to stock option grants and employee stock purchases under the Company’s employee stock purchase plan. The Company measures stock-based compensation expense based on the grant-date fair value of any awards granted to its employees. Such expense is recognized over the period of time that employees provide service and earn rights to the awards.

The estimated fair value of each stock option award granted was determined on the date of grant using the Black-Scholes option-pricing valuation model with the following weighted-average assumptions for options grants during the three months ended March 31, 2014. No options were granted during the three months ended March 31, 2013.


	Three Months Ended March 31,
	2014			2013
Stock Options
Risk free interest rate		1.77	%		—
Expected option term		6.0 years			—
Expected volatility of common stock		73.21	%		—
Expected dividend yield		0.0	%		—

The estimated fair value of each employee stock purchase plan award was determined on the date of grant using the Black-Scholes option-pricing valuation model with the following weighted-average assumptions for options grants during the three months ended March 31, 2014. The employee stock purchase plan did not become active until March 2014.


	Three Months Ended March 31,
	2014			2013
Employee Stock Purchase Plan
Risk free interest rate		0.08	%		—
Expected option term		6.0 months			—
Expected volatility of common stock		73.21	%		—
Expected dividend yield		0.0	%		—

The risk-free interest rate assumption was based on the yield of an applicable rate for U.S. Treasury instruments with maturities similar to those of the expected term of the award being valued. The assumed dividend yield was based on the Company never paying cash dividends and having no expectation of paying cash dividends in the foreseeable future. The weighted average expected term of options was calculated using the simplified method as prescribed by accounting guidance for stock-based compensation. This decision was based on the lack of relevant historical data due to the Company’s limited historical experience. In addition, due to the Company’s limited historical data, the estimated volatility was calculated based upon the Company’s historical volatility, supplemented with historical volatility of comparable companies in the biotechnology industry whose share prices are publicly available for a sufficient period of time.

The Company recognized non-cash stock-based compensation expense to employees and directors in its research and development and its general and administrative functions as follows:


	Three Months Ended March 31,				Period from January 29, 2007 (Inception) to March 31, 2014
	2014		2013		Period from January 29, 2007 (Inception) to March 31, 2014
Research and development	$	92,665	$	2,501	$	186,100
General and administrative		130,645		625		272,887

Total stock-based compensation expense	$	223,310	$	3,126	$	458,987

As of March 31, 2014, there was approximately $2,903,000 of unrecognized compensation costs related to outstanding employee and board of director options, which is expected to be recognized over a weighted average period of 1.73 years.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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+ Details

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2014
Accounting Policies [Abstract]
Unaudited Interim Financial Information	The accompanying interim condensed financial statements are unaudited. These unaudited interim financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and following the requirements of the U.S. Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by GAAP can be condensed or omitted. In management’s opinion, the unaudited interim financial statements have been prepared on the same basis as the audited financial statements and include all adjustments, which include only normal recurring adjustments, necessary for the fair presentation of the Company’s financial position and its results of operations and comprehensive loss and its cash flows for the periods presented. These statements do not include all disclosures required by GAAP and should be read in conjunction with the Company’s financial statements and accompanying notes for the fiscal year ended December 31, 2013, which is contained in the Company’s Annual Report on Form 10-K filed with the SEC on March 25, 2014. The results for interim periods are not necessarily indicative of the results expected for the full fiscal year or any other interim period.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting period. Actual results could differ from those estimates.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation expense for stock option grants and employee stock purchase plan shares is recorded at the estimated fair value of the award as of the grant date and is recognized as expense on a straight-line basis over the requisite service period of the stock-based award. The estimation of stock option and employee stock purchase plan fair value requires management to make estimates and judgments about, among other things, employee exercise behavior, forfeiture rates and volatility of the Company’s common stock. The judgments directly affect the amount of compensation expense that will be recognized.
Research and Development Expenses	Research and Development Expenses Research and development costs are expensed as incurred and primarily include compensation and related benefits, stock-based compensation expense, costs paid to third-party contractors to perform research, conduct clinical trials and develop drug materials and delivery devices. The Company expenses costs relating to the purchase and production of pre-approval product inventories as research and development expense in the period incurred until U.S. Food and Drug Administration (“FDA”) approval is received. The Company bases its expense accruals related to clinical studies on estimates of the services received and efforts expended pursuant to contracts with multiple research institutions and clinical research organizations that conduct and manage clinical studies on its behalf. The financial terms of these agreements vary from contract to contract and may result in uneven payment flows. Payments under some of these contracts depend on factors, such as the successful enrollment of patients, site initiation and the completion of clinical study milestones. Service providers typically invoice the Company monthly in arrears for services performed. In accruing service fees, the Company estimates the time period over which services will be performed and the level of effort to be expended in each period. If the Company does not identify costs that have begun to be incurred, or if the Company underestimates or overestimates the level of services performed or the costs of these services, actual expenses could differ from estimates. To date, the Company has not experienced significant changes in estimates of accrued research and development expenses after a reporting period. However, due to the nature of estimates, no assurance can be made that changes to the estimates will not be made in the future as the Company becomes aware of additional information about the status or conduct of clinical studies and other research activities. The Company does not own or operate manufacturing facilities for the production of EVK-001, nor does it plan to develop its own manufacturing operations in the foreseeable future. The Company currently depends on third-party contract manufacturers for all of its required raw materials, drug substance and finished product for its preclinical research and clinical trials. The Company does not have any current contractual relationships for the manufacture of commercial supplies of EVK-001. If EVK-001 is approved by any regulatory agency, the Company intends to enter into agreements with third-party contract manufacturers for the commercial production at that time. The Company currently utilizes a third-party consultant, which it engages on an as-needed, hourly basis, to manage its manufacturing contractors.
Net Loss Per Share	Net Loss Per Share Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares outstanding for the period, without consideration for common stock equivalents and adjusted for the weighted-average number of common shares outstanding that are subject to repurchase. The Company has excluded 94,375 and 109,375 weighted-average shares subject to repurchase from the weighted-average number of common shares outstanding for the three months ended March 31, 2014 and 2013, respectively. Diluted net loss per share is calculated by dividing the net loss by the weighted-average number of common share equivalents outstanding for the period determined using the treasury-stock method. Dilutive common stock equivalents are comprised of convertible preferred stock, warrants for the purchase of convertible preferred stock, warrants for the purchase of common stock, options outstanding under the Company’s equity incentive plans and potential shares to be purchased under the Company’s employee stock purchase plan. For the periods presented, there is no difference in the number of shares used to calculate basic and diluted shares outstanding due to the Company’s net loss position.
Recent Accounting Pronouncements	Recent Accounting Pronouncements During the quarter ended March 31, 2014, there were no new accounting pronouncements or updates to recently issued accounting pronouncements disclosed in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013 that affect the Company’s results of operations, financial condition, liquidity or disclosures.

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2014

Summary of Non-Cash Share-Based Compensation Expense

The Company recognized non-cash stock-based compensation expense to employees and directors in its research and development and its general and administrative functions as follows:


	Three Months Ended March 31,				Period from January 29, 2007 (Inception) to March 31, 2014
	2014		2013		Period from January 29, 2007 (Inception) to March 31, 2014
Research and development	$	92,665	$	2,501	$	186,100
General and administrative		130,645		625		272,887

Total stock-based compensation expense	$	223,310	$	3,126	$	458,987

Common stock options [Member]

Summary of Estimated Fair Value of Stock Option Award and Employee Stock Purchase Plan Award


	Three Months Ended March 31,
	2014			2013
Stock Options
Risk free interest rate		1.77	%		—
Expected option term		6.0 years			—
Expected volatility of common stock		73.21	%		—
Expected dividend yield		0.0	%		—

Employee stock purchase plan [Member]

Summary of Estimated Fair Value of Stock Option Award and Employee Stock Purchase Plan Award


	Three Months Ended March 31,
	2014			2013
Employee Stock Purchase Plan
Risk free interest rate		0.08	%		—
Expected option term		6.0 months			—
Expected volatility of common stock		73.21	%		—
Expected dividend yield		0.0	%		—

Acquisition of Technology - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	86 Months Ended
	Jun. 30, 2007	Mar. 31, 2014	Mar. 31, 2014	May 31, 2014
Business Acquisition, Contingent Consideration [Line Items]
Upfront payment expensed as in-process research and development	$ 650,000		$ 650,000
Scenario Forecast [Member] \| Questcor [Member] \| Patents [Member]
Business Acquisition, Contingent Consideration [Line Items]
Milestone payments				$ 51,500,000
Development Target One [Member] \| Questcor [Member] \| Patents [Member]
Business Acquisition, Contingent Consideration [Line Items]
Development targets description		Upon the initiation of the first patient dosing in its Phase 3 clinical trial for EVK-001
Development Target One [Member] \| Scenario Forecast [Member] \| Questcor [Member] \| Patents [Member]
Business Acquisition, Contingent Consideration [Line Items]
Milestone payments, pegged to development targets				500,000
Development Target One, Two and Three [Member] \| Scenario Forecast [Member] \| Questcor [Member] \| Patents [Member]
Business Acquisition, Contingent Consideration [Line Items]
Milestone payments, pegged to development targets				$ 4,500,000
Development Target Two [Member] \| Questcor [Member] \| Patents [Member]
Business Acquisition, Contingent Consideration [Line Items]
Milestone payments, pegged to development targets		$ 1,500,000	1,500,000
Development targets description		Upon the FDA's acceptance for review of a new drug application for EVK-001
Development Target Three [Member] \| Questcor [Member] \| Patents [Member]
Business Acquisition, Contingent Consideration [Line Items]
Milestone payments, pegged to development targets		$ 3,000,000	3,000,000
Development targets description		Upon the FDA's approval of EVK-001
Development Target Four [Member] \| Questcor [Member] \| Patents [Member]
Business Acquisition, Contingent Consideration [Line Items]
Milestone payments, pegged to development targets		$ 47,000,000	$ 47,000,000
Development targets description		Depend on EVK-001's commercial success and will only apply if EVK-001 receives regulatory approval. In addition, the Company will be required to pay to Questcor a low single digit royalty on net sales of EVK-001.
Expected expiration of patent right		2030

Organization and Basis of Presentation	3 Months Ended
Organization and Basis of Presentation	Mar. 31, 2014
Accounting Policies [Abstract]
Organization and Basis of Presentation	1. Organization and Basis of Presentation Evoke Pharma, Inc. (the “Company”) was incorporated in the state of Delaware on January 29, 2007 (inception). The Company is a publicly-held specialty pharmaceutical company focused primarily on the development of drugs to treat gastroenterological disorders and disease. Since its inception, the Company has devoted substantially all of its efforts to product development, raising capital and building infrastructure, and has not realized revenues from its planned principal operations. Accordingly, the Company is considered to be in the development stage.

Debt	3 Months Ended
Debt	Mar. 31, 2014
Debt Disclosure [Abstract]
Debt	3. Debt In June 2012, the Company entered into a $3 million loan and security agreement collateralized by the Company’s personal property. Interest on advances under the agreement is at a fixed interest rate equal to 4.50%. The loan and security agreement contains only non-financial covenants. Advances under the loan and security agreement had an interest-only period through December 31, 2013, and have a 24-month payback period that commenced in January 2014. The Company was advanced the entire $3 million as of January 2013.

Summary of Significant Accounting Policies - Summary of Weighted-Average Anti-Dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share (Detail) - shares	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share	732,090	2,584,252
Convertible preferred stock outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share		2,439,002
Warrants for convertible preferred stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share		22,000
Warrants for common stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share	96,000
Common stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share	634,750	123,250
Employee stock purchase plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive securities excluded from the calculation of diluted net loss per share	1,340

Debt - Additional Information (Detail) - Loan and security agreement [Member] - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2012	Jan. 31, 2013
Debt Instrument [Line Items]
Loan and security agreement, maximum credit capacity	$ 3
Loan and security agreement, interest rate	4.50%
Loan and security agreement, payback period	24 months
Loan and security agreement, amount drawn		$ 3

Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Equity [Abstract]
Shares, Granted		0
Unrecognized compensation costs	$ 2,903,000
Weighted average period	1 year 8 months 23 days

Condensed Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	6,099,547	6,096,752
Common stock, shares outstanding	6,099,547	6,096,752

Organization and Basis of Presentation - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]
Date of incorporation	Jan. 29, 2007

Summary of Significant Accounting Policies - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Weighted-average shares subject to repurchase excluded from the weighted-average number of common shares outstanding	94,375	109,375