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Acquisitions Fair Value Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value adjustment | $ (575) | $ (1,542)
Quickthree Technology LLC | Contingent Consideration |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance as of January 1, 2018 |  | 7,167
Payment of contingent consideration |  | (1,225)
Balance as of September 30, 2018 | $ 4,400 | $ 4,400

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