(Loss) Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net (loss) income	$ (6,461)	$ (1,062)	$ (508)	$ (2,044)	$ (29,390)	$ (45,120)	$ (299)	$ (1,874)	$ (2,552)	$ (2,173)	$ (3,614)	$ (47,293)	$ (10,075)	$ (76,683)	$ 15,869
Weighted average number of shares outstanding (in shares)													51,958	52,230	53,851
Issuance of warrants (in shares)													1,335	0	0
Weighted average shares outstanding - basic (in shares)													53,293	52,230	53,851
Employee stock options and restricted common shares (in shares)													0	0	1,093
Weighted average shares outstanding - diluted (in shares)													53,293	52,230	54,944
Basic (loss) earnings per share (in USD per share)		$ (0.02)	$ (0.01)	$ (0.04)	$ (0.57)	$ (0.87)	$ (0.01)	$ (0.03)	$ (0.05)	$ (0.04)	$ (0.07)	$ (0.90)	$ (0.19)	$ (1.47)	$ 0.29
Diluted (loss) earnings per share (in USD per share)		$ (0.02)	$ (0.01)	$ (0.04)	$ (0.57)	$ (0.87)	$ (0.01)	$ (0.03)	$ (0.05)	$ (0.04)	$ (0.07)	$ (0.90)	$ (0.19)	$ (1.47)	$ 0.29