CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Income	Noncontrolling Interest
Beginning Balances at Dec. 31, 2013	$ 24,744	$ 8	$ 348,912	$ (2,777)	$ (320,876)	$ 1,227	$ (1,750)
Beginning Balances (in shares) at Dec. 31, 2013		7,445
Net loss	(17,903)				(17,794)		(109)
Other comprehensive income	594					472	122
Issuance of common stock in connection with equity offerings, net of issuance costs	35,755	$ 3	35,752
Issuance of common stock in connection with capital raise and equity offerings, net of issuance costs (in shares)		2,803
Issuance of common stock in connection with ESPP	35		35
Issuance of common stock in connection with ESPP (in shares)		7
Issuance of common stock in connection with stock bonus and incentive plans	428		428
Issuance of common stock in connection with stock bonus and incentive plans (in shares)		42
Stock option grants in connection with stock bonus and incentive plans	68		68
Issuance of common stock in connection with exercise of options and warrants	869		869
Issuance of common stock in connection with exercise of options and warrants (in shares)		520
Stock-based compensation expense	1,877		1,877
Stock-based compensation expense (in shares)		5
Modification of equity awards	350		350
Issuance of warrants	1,110		1,110
Repurchase of common stock	(1,795)			(1,795)
Repurchase of common stock (in shares)		(182)
Ending Balances at Dec. 31, 2014	$ 46,132	$ 11	389,401	(4,572)	(338,670)	1,699	(1,737)
Ending Balances (in shares) at Dec. 31, 2014	10,640	10,640
Net loss	$ (39,220)				(39,144)		(76)
Other comprehensive income	971					974	(3)
Issuance of common stock in connection with settlement of earn-out	3,510		3,510
Issuance of common stock in connection with settlement of earn-out (in shares)		326
Issuance of common stock to acquire share of noncontrolling interest			(1,216)			(444)	1,660
Issuance of common stock to acquire share of noncontrolling interest (in shares)		95
Issuance of common stock in connection with exercise of options and warrants	46		46
Issuance of common stock in connection with exercise of options and warrants (in shares)		60
Stock-based compensation expense	4,666		4,666
Repurchase of common stock	(1,915)			(1,915)
Repurchase of common stock (in shares)		(374)
Ending Balances at Dec. 31, 2015	$ 14,190	$ 11	$ 396,407	$ (6,487)	$ (377,814)	$ 2,229	$ (156)
Ending Balances (in shares) at Dec. 31, 2015	10,747	10,747