Net (Loss) Income Per Share - Reconciliation of Basic and Diluted Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net (loss) income	$ (11,703)	$ 30,874	$ (865)	$ (8,864)	$ (8,605)	$ (13,018)	$ 18,306	$ (30,487)
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic shares (in shares)	58,213			37,436			51,206	37,382
Effect of dilutive securities—options and warrants outstanding (in shares)	0			0			1,643	0
Diluted shares (in shares)	58,213			37,436			52,849	37,382
Net income (loss) per share - basic (in dollars per share)	$ (0.20)			$ (0.24)			$ 0.36	$ (0.82)
Net income (loss) per share - diluted (in dollars per share)	$ (0.20)			$ (0.24)			$ 0.35	$ (0.82)