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Warrants - Additional Information (Detail)
Mar. 31, 2015
Common Stock  
Class of Warrant or Right [Line Items]  
Common stock warrants 198,662us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Convertible preferred stock warrants  
Class of Warrant or Right [Line Items]  
Number of shares underlying warrants 0us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember