Unaudited Condensed Consolidated Statement of Equity - 9 months ended Sep. 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	(18,906)					(18,906)
Foreign currency translation adjustment	134				134
Stock issued under employee stock purchase plan (in shares)			(81,000)
Stock issued under employee stock purchase plan	530			530
Common stock issued in payment of accrued liability	$ 188			188
Stock options exercised (in shares)	663,288	663,000
Stock options exercised	$ 5,884			5,884
Stock surrendered for exercise of stock options (in shares)			478,000
Stock surrendered for exercise of stock options	$ (5,863)		$ (5,863)
Restricted stock granted (in shares)	273,829	274,000
Restricted stock forfeited (in shares)			97,000
Treasury stock purchased (in shares)			151,000
Treasury stock purchased	$ (1,500)		$ (1,500)
Stock compensation expense	9,496			9,496
Repurchase of common stock (in shares)			680,000
Repurchase of common stock	(4,174)		$ (4,174)
Ending balance (in shares) at Sep. 30, 2017		60,622,000	3,354,000
Ending balance at Sep. 30, 2017	$ 273,490	$ 6	$ (31,806)	$ 334,490	$ (822)	$ (28,736)	$ 358