Net Income (Loss) Per Common Share - Reconciliation of the Numerators and Denominators of Basic and Diluted Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net loss used to compute net loss per common share:
Basic	$ (7,517)	$ (3,263)
Adjustment for change in fair value of liability classified stock options	(133)
Diluted	$ (7,650)	$ (3,263)
Weighted average number of common shares:
Basic	17,946,209	14,394,000
Adjustment for dilutive effect of stock options	28,260
Diluted	17,974,469	14,394,000
Net loss per common share - basic	$ (0.42)	$ (0.23)
Net loss per common share - diluted	$ (0.43)	$ (0.23)