Net Loss Per Share - Common Stock Equivalents Excluded From the Computation of Diluted Net Income (Loss) Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents excluded from the computation of diluted net income (loss) per share (in shares)	5,085	17,895	5,085	17,895
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents excluded from the computation of diluted net income (loss) per share (in shares)	597	597	597	597
RSAs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents excluded from the computation of diluted net income (loss) per share (in shares)	0	4,184	0	4,184
RSUs (non-vested)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents excluded from the computation of diluted net income (loss) per share (in shares)	4,488	13,114	4,488	13,114