Fair Value Measures (Details) (USD $)	Mar. 31, 2013	Feb. 22, 2013	Jan. 16, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Assets and liabilities measured at fair value
Convertible Notes	$ 9,482,000			$ 8,098,000
Total Liabilities	21,963,000	17,490,000	12,592,000	11,898,000	12,500,000	6,927,000
Balance
Assets and liabilities measured at fair value
Convertible Notes	9,482,000
Warrant liabilities	12,481,000
Total Liabilities	21,963,000
Significant Unobservable Inputs (Level 3)
Assets and liabilities measured at fair value
Convertible Notes	9,482,000			8,098,000
Warrant liabilities	12,481,000			3,800,000
Total Liabilities	$ 21,963,000