Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Numerator:
Net loss	$ (2,586)	$ (14,204)	$ (14,204)
Exclude (gain) loss from change in value in warrants	(4,400)	0
Net loss distributable to common stockholders – diluted	$ (6,986)	$ (14,204)
Shares used in computing net loss per share:
Weighted average basic shares outstanding - basic (in shares)	18,639	18,483	18,483
Effect of dilutive securities (in shares)	3,996	0
Weighted average common shares outstanding - diluted (in shares)	22,635	18,483	18,483
Loss per common share:
Loss per share of common stock — basic (in dollars per share)	$ (0.14)	$ (0.77)	$ (0.77)
Loss per share of common stock — diluted (in dollars per share)	$ (0.31)	$ (0.77)	$ (0.77)
Antidilutive shares (in shares)	200	4,200