Net Loss Per Share Attributable to Common Stockholders - Schedule of Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average outstanding shares of common stock equivalents excluded from the computation of diluted net loss per share	5,665	4,910
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average outstanding shares of common stock equivalents excluded from the computation of diluted net loss per share	2,994	3,080
Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average outstanding shares of common stock equivalents excluded from the computation of diluted net loss per share	2,492	1,638
ESPP
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average outstanding shares of common stock equivalents excluded from the computation of diluted net loss per share	179	192