Consolidated Statements of Shareholders' Equity (USD $)	Common stock	Additional paid-in capital	Accumulated other comprehensive loss	Accumulated deficit	Total
Beginning balances at Dec. 31, 2011	$ 17,000	$ 425,658,000	$ (35,000)	$ (414,838,000)	$ 10,802,000
Beginning balances, shares at Dec. 31, 2011	17,019,000
Share-based compensation expense	0	2,286,000	0	0	2,286,000
Share-based compensation expense, shares	648,000
Exercise of warrants and options	0	23,000	0	0	23,000
Exercise of warrants and options, shares	16,000
Sales of common stock and warrants	8,000	14,593,000	0	0	14,601,000
Sales of common stock and warrants, shares	7,554,000
Other comprehensive income (loss)	0	0	35,000	0	35,000
Net loss	0	0	0	(22,693,000)	(22,693,000)
Ending balances at Dec. 31, 2012	25,000	442,560,000	0	(437,531,000)	5,054,000
Ending balances, shares at Dec. 31, 2012	25,237,000
Share-based compensation expense	0	1,589,000	0	0	1,589,000
Share-based compensation expense, shares	323,000
Exercise of warrants and options	0	41,000	0	0	41,000
Exercise of warrants and options, shares	23,000
Sales of common stock and warrants	7,000	4,255,000	0	0	4,262,000
Sales of common stock and warrants, shares	6,128,000
Exchange of warrants	0	536,000	0	0	536,000
Exchange of warrants, shares	358,000
Net loss	0	0	0	(13,178,000)	(13,178,000)
Ending balances at Dec. 31, 2013	$ 32,000	$ 448,981,000	$ 0	$ (450,709,000)	$ (1,696,000)
Ending balances, shares at Dec. 31, 2013	32,069,000