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Fair Value Measurements - Contingent Promissory Note (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Carrying Balance  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Contingent promissory note payable to related party, Fair value $ 16,791
Fair Value  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Contingent promissory note payable to related party, Fair value $ 17,339