Quarterly report pursuant to sections 13 or 15(d)

9. Level 3 fair value inputs (Details)

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9. Level 3 fair value inputs (Details) (Level 3 [Member], USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Warrants [Member]
  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning Balance $ 4,892
Issuance of warrants 2,657
Issuance of notes and warrants 1,572
Issuance of notes 0
Conversion of notes 0
Exercises of warrants (260)
Adjustments to fair value for the period (3,370)
Ending Balance 5,491
Warrants [Member] | Issuance In January [Member]
  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Issuance of warrants 2,657
Warrants [Member] | Issuance In March [Member]
  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Issuance of notes and warrants 1,572
Warrants [Member] | Issuance In June [Member]
  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Issuance of notes 0
Conversion Features [Member]
  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning Balance 0
Issuance of warrants 0
Issuance of notes and warrants 1,401
Issuance of notes 2,929
Conversion of notes 4,269
Exercises of warrants 0
Adjustments to fair value for the period 1,078
Ending Balance 1,139
Conversion Features [Member] | Issuance In January [Member]
  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Issuance of warrants 0
Conversion Features [Member] | Issuance In March [Member]
  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Issuance of notes and warrants 1,401
Conversion Features [Member] | Issuance In June [Member]
  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Issuance of notes $ 2,929