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Summary of Significant Accounting Policies - Calculation of Net Loss and Number of Shares Used to Compute Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Net loss	$ (19,222)	$ (45,117)
Preferred stock dividends		(527)
Net loss - diluted	$ (19,222)	$ (45,644)
Weighted average shares outstanding - basic	26,705,375	14,039
Weighted average shares outstanding - diluted	26,705,375	14,039
Net loss per share - basic	$ (0.72)	$ (3,250)
Net loss per share - diluted	$ (0.72)	$ (3,250)

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