Consolidated Statements of Shareholders' Equity (Unaudited) - 9 months ended Sep. 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	5,321			5,321
Non-employee warrant awards	571			571
Issuance of common stock and treasury stock, net of issuance costs	22,831	$ 31	$ 407	22,393
Issuance of common stock and treasury stock, net of issuance costs, Shares		30,220	211
Exercise of stock options and warrants	7,738	$ 5		7,733
Exercise of stock options and warrants, Shares		5,204
Award of restricted stock units, Shares		355
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	9,515					9,515
Net loss	(68,640)				(68,640)
Balance at Sep. 30, 2017	$ 100,565	$ 155	$ (2)	$ 468,150	$ (371,484)	$ 3,746
Balance, Shares at Sep. 30, 2017		155,283	(2)