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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

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