CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Total
Balance at beginning of period at Dec. 31, 2017	$ 2	$ (959)	$ 144,074	$ (19,229)	$ 123,888
Balance at beginning of period (in shares) at Dec. 31, 2017	19,371,005	(73,466)
Increase (Decrease) in Stockholders' Equity
Common stock offering issuance costs			(2)		(2)
Issuance of restricted stock (in shares)	395,254
Shares surrendered by stockholder		(2,474)
Shares repurchased		$ (2,866)			(2,866)
Shares repurchased (in shares)		(80,000)
Net exercise of stock options			(18)		(18)
Net exercise of stock options (in shares)	210,474
Exercise of stock options			920		920
Exercise of stock options (in shares)	164,430
Stock based compensation expense			1,945		1,945
Net loss				(18,094)	(18,094)
Balance at end of period at Mar. 31, 2018	$ 2	$ (3,825)	$ 146,919	$ (37,323)	$ 105,773
Balance at end of period (in shares) at Mar. 31, 2018	20,141,163	(155,940)