Consolidated Statements of Shareholders' Equity (Unaudited) - 3 months ended Mar. 31, 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 [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	2,139			2,139
Issuance of common stock and treasury stock, net of issuance costs	5,478	$ 4	$ 407	5,067
Issuance of common stock and treasury stock, net of issuance costs, Shares		3,795	211
Award of restricted stock units, Shares		331
Return of common stock to pay withholding taxes on restricted stock	(166)		$ (166)
Return of common stock to pay withholding taxes on restricted stock, Shares			(117)
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
Other comprehensive gain	1,133					1,133
Net loss	(15,414)				(15,414)
Balance at Mar. 31, 2017	$ 116,267	$ 123		$ 439,038	$ (318,258)	$ (4,636)
Balance, Shares at Mar. 31, 2017		123,630