Unaudited Condensed Consolidated Statement of Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)	Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2016		59,685,000	2,029,000
Beginning balance at Dec. 31, 2016	$ 287,701	$ 6	$ (20,269)	$ 318,392	$ (956)	$ (9,830)	$ 358
Increase (Decrease) in Equity [Roll Forward]
Net loss	(15,803)					(15,803)
Foreign currency translation adjustment	(14)				(14)
Stock issued in payment of stock purchase plan (in shares)			(40,000)
Stock issued under employee stock purchase plan	368			368
Common stock issued in payment of accrued liability	$ 188			188
Stock options exercised (in shares)	651,188	651,000
Stock options exercised	$ 5,834			5,834
Stock surrendered for exercise of stock options (in shares)			470,000
Exercise of stock options by common stock surrender	$ 5,814		$ 5,814
Restricted stock granted (in shares)	168,756	169,000
Restricted stock forfeited (in shares)			76,000
Treasury stock purchased (in shares)			125,000
Treasury stock purchased	$ (1,335)		$ (1,335)
Stock compensation expense	6,344			6,344
Treasury stock purchased (in shares)			50,000
Treasury stock purchased	(487)		$ (487)
Ending balance (in shares) at Jun. 30, 2017		60,505,000	2,710,000
Ending balance at Jun. 30, 2017	$ 276,982	$ 6	$ (27,905)	$ 331,126	$ (970)	$ (25,633)	$ 358