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Net Loss Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares subject to outstanding common stock options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 4,353,167 6,400,175 8,145,777
Shares subject to unvested restricted stock awards      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0 163,332
Shares subject to unvested restricted stock units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 3,039,020 2,359,261 574,072
Shares issuable pursuant to the ESPP      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 76,466 105,583 85,509
Class A Common Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 4,300,000