Consolidated Statements of Shareholders' Equity (Unaudited) - 6 months ended Jun. 30, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Balance at Dec. 31, 2016	$ 117,870	$ 115	$ (241)	$ 426,609	$ (302,844)	$ (5,769)
Balance, Shares at Dec. 31, 2016		115,781	(94)
Stock-based compensation	3,679			3,679
Issuance of common stock and treasury stock, net of issuance costs	20,478	$ 29	$ 407	20,042
Issuance of common stock and treasury stock, net of issuance costs, Shares		28,695	211
Award of restricted stock units, Shares		339
Return of common stock to pay withholding taxes on restricted stock	(168)		$ (168)
Return of common stock to pay withholding taxes on restricted stock, Shares			(119)
Issuance of common stock in exchange for contingent consideration	5,227	$ 4		5,223
Issuance of common stock in exchange for contingent consideration, Shares		3,723
Relative fair value of warrants issued with debt	300			300
Other comprehensive income	6,563					6,563
Net loss	(30,127)				(30,127)
Balance at Jun. 30, 2017	$ 123,822	$ 148	$ (2)	$ 455,853	$ (332,971)	$ 794
Balance, Shares at Jun. 30, 2017		148,538	(2)