Net Income (Loss) Per Common and Preferred Share - Computation of Basic and Diluted Net Loss Per Common and Preferred Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Allocation of loss attributed to shareholders
Basic	$ (9,627)	$ (6,498)	$ (20,538)	$ (10,560)
Basic	$ 380	$ 1,303	$ 810	$ 996
Weighted average number of shares:
Basic	25,773,879	14,306,491	25,763,858	16,055,456
Diluted	25,775,559	14,306,491	25,763,858	16,055,456
Common Shares [Member]
Allocation of loss attributed to shareholders
Basic	$ (9,627)	$ (6,498)	$ (20,538)	$ (10,560)
Adjustment for change in fair value of liability classified stock options	(5)
Diluted	$ (9,632)	$ (6,498)	$ (20,538)	$ (10,560)
Weighted average number of shares:
Basic	25,773,879	14,306,491	25,763,858	16,055,456
Adjustment for dilutive effect of stock options	1,680
Diluted	25,775,559	14,306,491	25,763,858	16,055,456
Net loss attributable to shareholders per share - basic	$ (0.37)	$ (0.45)	$ (0.80)	$ (0.66)
Net loss attributable to shareholders per share - diluted	$ (0.37)	$ (0.45)	$ (0.80)	$ (0.66)
Preferred Shares [Member]
Allocation of loss attributed to shareholders
Basic	$ (380)	$ (1,303)	$ (810)	$ (996)
Diluted	$ (380)	$ (1,303)	$ (810)	$ (996)
Weighted average number of shares:
Basic	1,016,000	2,868,000	1,016,000	1,513,667
Diluted	1,016,000	2,868,000	1,016,000	1,513,667
Net loss attributable to shareholders per share - basic	$ (0.37)	$ (0.45)	$ (0.80)	$ (0.66)
Net loss attributable to shareholders per share - diluted	$ (0.37)	$ (0.45)	$ (0.80)	$ (0.66)