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Net Loss Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
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) 2,267,032 3,265,977
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) 2,036,160 2,974,719
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) 55,561 95,084
Convertible Debt Securities    
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 4,300,000