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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]  
Balance at December 31, 2014 $ 225
Total change in the liability included in earnings (161)
Fair value of warrants exercised (123)
Fair value of warrants issued 820
Balance at June 30, 2015 $ 761