Net Income (Loss) Per Common Share - Computation of Numerators and Denominators of Basic and Diluted Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Allocation of loss attributed to shareholders
Basic	$ (170)	$ (9,627)	$ (7,437)	$ (20,538)
Adjustment for change in fair value of liability classified stock options		(5)
Diluted	$ (170)	$ (9,632)	$ (7,437)	$ (20,538)
Weighted average number of shares:
Basic	34,979,282	25,773,879	34,084,508	25,763,858
Adjustment for dilutive effect of stock options		1,680
Diluted	34,979,282	25,775,559	34,084,508	25,763,858
Net loss attributable to shareholders per share - basic	$ 0.00	$ (0.37)	$ (0.22)	$ (0.80)
Net loss attributable to shareholders per share - diluted	$ 0.00	$ (0.37)	$ (0.22)	$ (0.80)