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Redeemable Convertible Preferred Stock and Equity (Deficit) - Summary of Common Stock Reserved for Future Issuance (Detail) - shares
shares in Thousands
Dec. 31, 2015
Dec. 31, 2014
Class Of Stock [Line Items]    
Common stock, shares outstanding 61,985 59,046
Stock options outstanding 13,583 14,427
RSUs outstanding 865 560
Common stock warrants outstanding 7 173
Shares reserved for future stock options and RSUs grant 3,394 5,358
Shares reserved for future ESPP offering 81,119 81,164
ESPP [Member]    
Class Of Stock [Line Items]    
Shares reserved for future ESPP offering 1,285 1,600