Stock-Based Compensation - Summary of RSU Activity (Details) - RSUs shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Number of Share Units
Share Units, Outstanding as of December 31,2020 | shares	4,061
Share Units, Granted | shares	1,351
Share Units, Vested and delivered | shares	(1,171)
Share Units, Forfeited or cancelled | shares	(37)
Share Units, Outstanding as of March 31,2021 | shares	4,204
Weighted- Average Grant Date Fair Value
Weighted- Average Grant Date Fair Value, Outstanding as of December 31, 2020 | $ / shares	$ 8.31
Weighted-Average Grant Date Fair Value, Granted | $ / shares	15.17
Weighted-Average Grant Date Fair Value, Vested and delivered | $ / shares	8.20
Weighted- Average Grant Date Fair Value, Forfeited or cancelled | $ / shares	8.54
Weighted- Average Grant Date Fair Value, Outstanding as of March 31,2021 | $ / shares	$ 10.54	[1],[2]

[1] Included in “Outstanding as of March 31, 2021” are 108 shares of Restricted Stock that were delivered, but not yet vested.

[2] Included in “Outstanding as of March 31, 2021” are 91 RSUs that were vested, but not yet delivered