Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Reconciliation of Fair Value of Liabilities (Details)

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Fair Value Measurements - Reconciliation of Fair Value of Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance $ 9,998   $ 12,237
Issuance of warrants 0   544
Excess of fair value of warrants over proceeds 0   362
Adjustment to fair value (7,297)   (10,442)
Reclassification to additional paid-in capital upon exercise of warrants (2,701) $ 0 (2,701)
Ending balance $ 0   $ 0