Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Changes in Level 3 Fair Values (Details)

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Fair Value Measurements - Changes in Level 3 Fair Values (Details) - Level 3 - Contingent Consideration - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 541 $ 841
Initial contingent consideration 812 245
Net gain on change in fair value (755) (692)
Balance at end of period $ 598 $ 394