CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative liabilities	$ 0	$ 13,900
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock liquidation preference (in dollars per share)	$ 0	$ 0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	45,000,000	45,000,000
Common stock, shares issued	15,080,594	15,018,870
Treasury stock, shares	0	0
Series A Preferred Stock
Preferred stock, shares issued	0	0
Series B Preferred Stock
Preferred stock, shares issued	0	0