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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   $ 121,781us-gaap_RetainedEarningsAccumulatedDeficit     $ 98,439us-gaap_RetainedEarningsAccumulatedDeficit  
Proceeds from initial public offering, net   59,862us-gaap_ProceedsFromIssuanceInitialPublicOffering        
Reverse Stock Split, Conversion Ratio 14.5074us-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     1,069,715us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		 8,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		    
Issuance/sale of stock, price per share     $ 7.00us-gaap_SharesIssuedPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		 $ 7.00us-gaap_SharesIssuedPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		    
Proceeds from initial public offering, net     $ 59,900us-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       9,728,237us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		   6,826,004us-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.       1,857,226us-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   9,569,715us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		        
Conversion of preferred warrants to common warrants.       128,663us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember