CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Balance, beginning at Dec. 31, 2013	$ 79	$ 548,510	$ (466,677)	$ (192)	$ (2,741)	$ 78,979
Balance, beginning (in shares) at Dec. 31, 2013	61,025				(200)
Net loss			(20,386)			(20,386)
Compensation expenses for share-based payment arrangements		2,251				2,251
Sale of common stock in public offering, net of underwriting discounts and commissions and offering expenses	$ 12	37,447				37,459
Public Offering shares issued	8,750
Acquisition of subsidiary escrow shares returned		(82)				(82)
Acquisition of subsidiary escrow shares returned - shares	(19)
Balance, ending at Jun. 30, 2014	$ 91	588,126	(487,063)	(192)	$ (2,741)	98,221
Balance, ending (in shares) at Jun. 30, 2014	69,756				(200)
Balance, beginning at Dec. 31, 2014	$ 91	589,826	(462,267)	0	$ (2,741)	124,909
Balance, beginning (in shares) at Dec. 31, 2014	69,833				(200)
Net loss			(21,951)			(21,951)
Compensation expenses for share-based payment arrangements		2,211				2,211
Exercise of stock options		116				116
Exercise of stock options (in shares)	23
Acquisition of subsidiary escrow shares returned						0
Balance, ending at Jun. 30, 2015	$ 91	$ 592,153	$ (484,218)	$ 0	$ (2,741)	$ 105,285
Balance, ending (in shares) at Jun. 30, 2015	69,856				(200)