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Summary of Significant Accounting Policies - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 133
Reclassification of preferred stock warrant to common stock warrant 51
Ending balance $ 82