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Fair Value Measurement and Financial Instruments - Summary of Changes in Instruments Measured on Recurring Basis (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]  
Balance at December 31, 2017 $ 478
Change in fair value 1,396
Reclassification to additional paid in capital (1,874)
Balance at September 30, 2018 $ 0