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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 30, 2018
Loss Contingencies [Line Items] |  |  |  |
Operating leases, rent expense | $ 6,463 | $ 6,362 | $ 6,147 |
Undisclosed Name of Acquiree One |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Contingent consideration, liability, certain acquired receivables | $ 425 |  |  |
Contingent consideration, liability, acquired receivables, payment period | 15 months |  |  |
Undisclosed Name of Acquiree Two |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Contingent consideration, liability, revenue earn-outs, payment period | 5 years |  |  |
Contingent consideration, liability, fair value | $ 599 |  |  | $ 555
Contingent consideration liabilities | 2,000 |  |  |
Undisclosed Name Of Acquiree Three |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Contingent consideration liabilities | $ 363 |  |  |

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