Net (Loss) Income Per Common Share - Basic Net (Loss) Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net (loss) income	$ (19,417)	$ 12,379	$ (32,704)	$ (18,104)
Adjustments to reconcile to net (loss) income available to common stockholders
Accrued dividend on Series B Convertible Preferred Stock	997	0	997	0
Amortization of beneficial conversion feature	31,110	0	31,110	0
Accretion of increasing-rate dividend feature	458	0	458	0
Total adjustments	32,565	0	32,565	0
Net (loss) income available to common stockholders	$ (51,982)	$ 12,379	$ (65,269)	$ (18,104)
Weighted average shares outstanding - basic (in shares)	108,493,208	107,157,561	108,222,419	106,929,643
Basic net (loss) income per common share (in dollars per share)	$ (0.48)	$ 0.12	$ (0.60)	$ (0.17)