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Fair Value - Schedule of Changes in Level 3 Liabilities Measured at Fair Value on a Recurring Basis (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Fair Value Disclosures [Abstract]  
Balance at beginning $ 940
Issuance of warrants 2,074
Modification of warrants 389
Fair value adjustments (2,385)
Balance at ending $ 1,018