Net Income (Loss) Per Common Share and Preferred Share - Reconciliation of Numerators and Denominators of Basic and Diluted Net Loss Per Common Share and Preferred Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Allocation of loss used attributed to shareholders:
Basic	$ (31,616)	$ (30,704)
Basic	$ 2,881
Weighted average number of shares:
Basic	19,425,711	17,985,061
Diluted	19,425,711	18,001,759
Basic	$ (1.63)	$ (1.71)
Diluted	$ (1.63)	$ (1.72)
Common Shares [Member]
Allocation of loss used attributed to shareholders:
Basic	$ (31,616)	$ (30,704)
Adjustment for change in fair value of liability classified stock options		(187)
Diluted	$ (31,616)	$ (30,891)
Weighted average number of shares:
Basic	19,425,711	17,985,061
Adjustment for dilutive effect of stock options		16,698
Diluted	19,425,711	18,001,759
Basic	$ (1.63)	$ (1.71)
Diluted	$ (1.63)	$ (1.72)
Preferred Shares [Member]
Allocation of loss used attributed to shareholders:
Basic	$ (2,881)
Diluted	$ (2,881)
Weighted average number of shares:
Basic	1,769,900
Diluted	1,769,900
Basic	$ (1.63)
Diluted	$ (1.63)