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Net Loss Per Share - Computation of Diluted Net Loss Per Share Effect in Antidilutive (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Stock Options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share 3,419 3,376 3,419 3,376
Restricted Stock Units and Restricted Stock Units with Performance Conditions        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share 1,127 686 1,127 686
Employee Stock Purchase Plan Shares        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share 72 62 72 62