Earnings Per Share - Components of Diluted Loss (Details) - USD ($) $ / shares in Units, $ 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
Numerator
Net loss	$ (63,177)	$ 3,995	$ (20,215)	$ (36,368)	$ (25,017)	$ (18,508)	$ (79,397)	$ (79,893)
Denominator
Weighted average common stock outstanding – basic (in shares)	58,747,146			53,857,616			56,329,863	53,735,106
Weighted average common stock outstanding – diluted (in shares)	58,747,146			53,857,616			56,329,863	53,735,106
Loss per basic common share (usd per share)	$ (1.08)			$ (0.68)			$ (1.41)	$ (1.49)
Loss per diluted common share (usd per share)	$ (1.08)			$ (0.68)			$ (1.41)	$ (1.49)