Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2010		$ 2	$ 183,140	$ (131,347)
Balance (in shares) at Dec. 31, 2010		23,662
Increase (Decrease) in Stockholders' Equity
Share-based compensation	2,191		2,191
Shares issued for benefit plans and option exercises	65		65
Shares issued for benefit plans and option exercises (in shares)		181
Shares and warrants issued for services received	6		6
Net loss	(18,933)			(18,933)
Balance at Dec. 31, 2011	35,124	2	185,402	(150,280)
Balance (in shares) at Dec. 31, 2011		23,843
Increase (Decrease) in Stockholders' Equity
Share-based compensation	1,784		1,784
Issuance of common stock	2,490		2,490
Issuance of common stock (in shares)		1,000
Shares issued for benefit plans and option exercises	171		171
Shares issued for benefit plans and option exercises (in shares)		188
Shares and warrants issued for services received	20		20
Shares and warrants issued for services received (in shares)		6
Value of beneficial conversion option	362		362
Warrant issued	1,182		1,182
Net loss	(31,812)			(31,812)
Balance at Dec. 31, 2012	$ 9,321	$ 2	$ 191,411	$ (182,092)
Balance (in shares) at Dec. 31, 2012		25,037