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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Fair value of embedded conversion features and warrants    
Beginning Balance $ 6,718 $ 4,507
Derivatives added in connection with issuance of debt and equity 4,762 5,236
Derivatives reclassified to equity in connection with repayment and conversion of debt (20,075) (19,286)
Net increase in fair value 8,595 16,261
Ending Balance    $ 6,718