Stockholders' Equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Nov. 30, 2012	Dec. 31, 2011
Detachable Common Stock Warrant related to Term Loan [Abstract]
Shares issued relating to detachable warrants (in shares)	1,731
Initial fair value of warrants issued	$ 1,108
Adjusted exercise price (in dollars per share)	$ 2.30	$ 1.20
Warrants outstanding, beginning balance (in shares)	871
Granted (in shares)	1,731
Warrants outstanding, ending balance (in shares)	2,602
Weighted Average Exercise Price, beginning balance (in dollars per share)	$ 4.95		$ 12.23
Weighted Average Exercise Price, granted (in dollars per share)	$ 1.28
Weighted Average Exercise Price, ending balance (in dollars per share)	$ 4.95		$ 12.23
Weighted Average Remaining Life	6 years 4 months 2 days
Change in discount on Term Loan and Common Stock Warrants	$ 305
Sixth Amended and Restated Certificate of Incorporation [Abstract]
Common stock, shares authorized (in shares)	70,000		70,000
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001
Preferred stock, shares authorized (in shares)	10,000		10,000
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001