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Nature of Business and Operations - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2014 | May 07, 2014 | Apr. 15, 2014 | Dec. 31, 2013 | Apr. 30, 2014
Nature Of Business And Operations [Line Items] |  |  |  |  |  |
Date of Company's incorporation |  | Nov. 28, 2005 |  |  |  |
Accumulated deficit |  | $ 121,781 us-gaap_RetainedEarningsAccumulatedDeficit |  |  | $ 98,439 us-gaap_RetainedEarningsAccumulatedDeficit |
Proceeds from initial public offering, net |  | 59,862 us-gaap_ProceedsFromIssuanceInitialPublicOffering |  |  |  |
Reverse Stock Split, Conversion Ratio | 14.5074 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |  |  |  |  |
IPO [Member] |  |  |  |  |  |
Nature Of Business And Operations [Line Items] |  |  |  |  |  |
Common stock issuance date |  | Apr. 15, 2014 |  |  |  |
Issuance of Common Stock from initial public offering, shares |  |  | 1,069,715 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember | 8,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |
Issuance/sale of stock, price per share |  |  | $ 7.00 us-gaap_SharesIssuedPricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember | $ 7.00 us-gaap_SharesIssuedPricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |
Proceeds from initial public offering, net |  |  | $ 59,900 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |
Reverse stock split of common stock |  | The Company’s board of directors and stockholders approved a 1-for-14.5074 reverse stock split of the Company’s common stock effective March 31, 2014. |  |  |  |
Convertible preferred stock, shares issued upon conversion |  |  |  | 9,728,237 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  | 6,826,004 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember
Preferred stock conversion basis |  | In connection with the closing of the IPO, all of the Company’s outstanding redeemable convertible preferred stock and convertible notes automatically converted into shares of common stock as of April 15, 2014. |  |  |  |
IPO [Member] | Preferred Stock [Member] |  |  |  |  |  |
Nature Of Business And Operations [Line Items] |  |  |  |  |  |
Conversion of preferred warrants to common warrants. |  |  |  | 1,857,226 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |
IPO [Member] | Common Stock [Member] |  |  |  |  |  |
Nature Of Business And Operations [Line Items] |  |  |  |  |  |
Issuance of Common Stock from initial public offering, shares |  | 9,569,715 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |  |  |
Conversion of preferred warrants to common warrants. |  |  |  | 128,663 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |

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