Summary of Significant Accounting Policies - Computation of Earnings (Loss) 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	Jul. 20, 2020
Basic loss per share computation:
Net income/(loss)	$ (510)	$ (7,113)	$ (41,678)	$ (19,826)
Weighted average common shares - basic and diluted (in shares)	6,082,517	5,385,041	5,690,164	5,383,531
Basic and diluted loss per share (in dollars per share)	$ (0.08)	$ (1.32)	$ (7.32)	$ (3.68)
Warrants outstanding (in shares)	134,667		134,667
Exercise price (dollars per share)	$ 0.01		$ 0.01		$ 0.01
Pre-reverse stock split shares (in shares)	538,995		538,995