Income (loss) Per Share - 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 income (loss)	$ (7,204)	$ 11,743	$ (3,666)	$ (2,859)	$ (2,894)	$ (2,901)	$ 873	$ (8,654)
Less: Dividend paid in-kind to preferred stockholders	(89)			(85)			(260)	(250)
Less: Deemed dividend on preferred stock	(150)			(130)			(435)	(377)
Net income (loss) attributable to common stockholders	(7,443)			(3,074)			178	(9,281)
Income (loss) per share - basic:
Numerator for basic income (loss) per share	$ (7,443)			$ (3,074)			$ 178	$ (9,281)
Denominator for basic income (loss) per share (shares)	9,758,332			9,234,869			9,758,332	7,107,678
Basic income (loss) per common share (usd per share)	$ (0.76)			$ (0.33)			$ 0.02	$ (1.31)
Income (loss) per share - diluted:
Numerator for basic income (loss) per share	$ (7,443)			$ (3,074)			$ 178	$ (9,281)
Net income (loss) attributable to common stockholders - diluted	$ (7,443)			$ (3,074)			$ 178	$ (9,281)
Denominator for basic income (loss) per share (shares)	9,758,332			9,234,869			9,758,332	7,107,678
Plus: Incremental shares underlying “in the money” stock options outstanding (shares)	0			0			18,556	0
Denominator for diluted income (loss) per share (shares)	9,758,332			9,234,869			9,776,888	7,107,678
Diluted net income (loss) per common share (usd per share)	$ (0.76)			$ (0.33)			$ 0.02	$ (1.31)