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Net Loss per Common Share - Calculation of Net Loss and Number of Shares Used to Compute Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net (loss) income - basic		$ (7,519)	$ (5,959)	$ (7,894)	$ (8,880)	$ (6,658)	$ 7,185	$ (21,371)	$ (8,353)
Preferred stock dividends		(18,238)						(18,238)
Adjustment for gain on warrant income					(13)				(534)
Net loss - diluted		$ (25,757)			$ (8,893)			$ (39,609)	$ (8,887)
Weighted average shares outstanding - basic	[1]	18,277,807			35,859,866			16,166,307	13,888,577
Weighted average shares outstanding - diluted	[1]	18,277,807			35,859,866			16,166,307	13,888,587
Net loss per share - basic	[1]	$ (0.41)			$ (0.25)			$ (1.32)	$ (0.60)
Net loss per share - diluted	[1]	$ (1.41)			$ (0.25)			$ (2.45)	$ (0.64)
[1] reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.

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