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Stockholders' Equity - Outstanding and Reserved Shares of Common Stock for Future Issuance (Detail) - shares
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]      
Options outstanding (in shares) 1,154,000 1,811,000 3,370,000
Total reserved shares of common stock for future issuance (in shares) 49,724,000    
2012 Equity Incentive Plan      
Class of Stock [Line Items]      
Total reserved shares of common stock for future issuance (in shares) 29,641,000    
2012 Employee Stock Purchase Plan      
Class of Stock [Line Items]      
Total reserved shares of common stock for future issuance (in shares) 10,196,000    
Common stock options      
Class of Stock [Line Items]      
Options outstanding (in shares) 1,154,000    
Restricted stock units      
Class of Stock [Line Items]      
RSUs (in shares) 8,733,000 10,202,000 11,403,000