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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
		Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net loss - basic		$ (7,893)	$ 7,187
Adjustment for gain on warrant income			(14,697)
Net loss - diluted		$ (7,893)	$ (7,510)
Weighted average shares outstanding - basic	[1]	73,558,713	658,893
Weighted average shares outstanding - diluted	[1]	73,558,713	658,893
Net loss per share - basic	[1]	$ (0.11)	$ 10.91
Net loss per share - diluted*	[1]	$ (0.11)	$ 10.91
[1] reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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