Earnings Per Share - Components of Diluted Loss (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator
Net loss	$ 3,995	$ (20,215)	$ (25,017)	$ (18,508)	$ (16,220)	$ (43,525)
Denominator
Weighted average common stock outstanding – basic (in shares)	56,272,446		53,714,998		55,107,940	53,672,835
Weighted average common stock outstanding – diluted (in shares)	56,796,936		53,714,998		55,107,940	53,672,835
Loss per basic common share (usd per share)	$ 0.07		$ (0.47)		$ (0.29)	$ (0.81)
Loss per diluted common share (usd per share)	$ 0.07		$ (0.47)		$ (0.29)	$ (0.81)
Stock options using the treasury method
Denominator
Incremental awards attributable to dilutive effect of share-based payment arrangements (in shares)	2,628		0		0	0
Restricted stock
Denominator
Incremental awards attributable to dilutive effect of share-based payment arrangements (in shares)	521,862		0		0	0