Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Changes in Fair Value of Level 3 Liabilities (Details)

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Fair Value Measurements - Changes in Fair Value of Level 3 Liabilities (Details) - Level 3
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at beginning of period $ 625
(Gains) losses reported in earnings (53)
Balance at end of period $ 572