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Redeemable Convertible Preferred Stock and Equity (Deficit) - Schedule of Warrants to Purchase Shares of Common Stock (Detail)
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Class Of Warrant Or Right [Line Items]  
Number of Shares 7,138
Year of Issuance 1996 [Member]  
Class Of Warrant Or Right [Line Items]  
Year of Issuance 1996
Number of Shares 1,600
Exercise Price per Share | $ / shares $ 4.38
Reason for Issuance Issued in connection with lease agreement
Expiration Date Five years after initial public offering or upon merger or sale of the Company’s assets, whichever occurs first
Year of Issuance 2000 [Member]  
Class Of Warrant Or Right [Line Items]  
Year of Issuance 2000
Number of Shares 5,538
Exercise Price per Share | $ / shares $ 15.00
Reason for Issuance Issued in connection with lease agreement
Expiration Date Five years after initial public offering or upon merger or sale of the Company’s assets, whichever occurs first