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Warrant Liability - Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Warrant Liability [Abstract]    
Balance, beginning $ 25,080 $ 31,213
Adjustment to fair value of warrants exercised cashlessly (15) (222)
Adjustment to fair value of unexercised warrants Balance - March 31, 2016 (6,687) (5,911)
Balance, ending $ 18,378 $ 25,080