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Derivative liability (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at beginning of period $ 281
Additional liabilities recorded related to note financing 55
Additional liabilities recorded related to warrants issued for services 3
Gain on derivative liability (211)
Balance at end of period $ 128