Stockholders’ Equity and Stock-based Compensation - Schedule of Income (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income (loss)	$ (5,614)	$ 64,327	$ 64,671	$ (110,923)	$ (9,152)	$ (6,255)	$ 123,384	$ (126,329)
Denominator:
Denominator for basic net income (loss) per share - weighted average shares outstanding (in shares)	60,589,566			62,722,340			59,873,199	64,244,006
Dilutive options and unvested stock units outstanding (in shares)	0			0			4,056,805	0
Dilutive warrants outstanding (in shares)	0			0			302,533	0
Denominator for diluted net income (loss) per share - adjusted weighted average shares outstanding (in shares)	60,589,566			62,722,340			64,232,537	64,244,006
Net income (loss) per share - diluted (in dollars per share)	$ (0.09)			$ (1.77)			$ 1.92	$ (1.97)