Statement of Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income/(loss) [Member]
Beginning Balance at Dec. 31, 2010	$ 64,362	$ 716	$ 380,929	$ (317,755)	$ 472
Beginning Balance, shares at Dec. 31, 2010		71,640,000
Net loss	(7,283)			(7,283)
Other comprehensive income (loss)	108				108
Exercise of stock options and issuance of common stock underlying restricted stock units	55	3	52
Exercise of stock options and issuance of common stock underlying restricted stock units, shares		273,000
Non-cash compensation expense related to grant of equity based compensation	3,106		3,106
Ending Balance at Dec. 31, 2011	60,348	719	384,087	(325,038)	580
Ending Balance, shares at Dec. 31, 2011		71,913,000
Net loss	(22,899)			(22,899)
Other comprehensive income (loss)	(333)				(333)
Issuance of common stock	48,709	139	48,570
Issuance of common stock, shares		13,909,000
Exercise of stock options and issuance of common stock underlying restricted stock units	(29)	3	(32)
Exercise of stock options and issuance of common stock underlying restricted stock units, shares		314,000
Non-cash compensation expense related to grant of equity based compensation	3,290		3,290
Ending Balance at Dec. 31, 2012	89,086	861	435,915	(347,937)	247
Ending Balance, shares at Dec. 31, 2012		86,136,000
Net loss	(31,238)			(31,238)
Other comprehensive income (loss)	(236)				(236)
Exercise of stock options and issuance of common stock underlying restricted stock units	334	7	327
Exercise of stock options and issuance of common stock underlying restricted stock units, shares		642,000
Non-cash compensation expense related to grant of equity based compensation	3,466		3,466
Ending Balance at Dec. 31, 2013	$ 61,412	$ 868	$ 439,708	$ (379,175)	$ 11
Ending Balance, shares at Dec. 31, 2013		86,778,000