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Fair Value Measurements - Narrative (Details) - Level 2
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Maturity term of debt 2 years 6 months
Contingent promissory note payable  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Contingent promissory note payable $ 20,000,000.0