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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Roll-forward of the fair value of the assets, where fair value is determined by Level 3 inputs  
Issuance of shares of Series A-6 - prepayment $ 1,220
Conversion of amount receivable in shares of series A-6 stock to amount payable in cash under the Nordic amendment (1,220)
Roll-forward of the fair value of the liabilities, where fair value is determined by Level 3 inputs  
Balance at the beginning of the period 7,273
Issuance of shares of Series A-6 (8,889)
Additions - accrued shares of Series A-6 2,717
Additions - warrants 1,511
Change in fair value 505
Warrants liability reclassified to equity $ (3,117)