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Acquisitions - Manatee Works Inc. Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 21, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Revaluation of contingent consideration |  | $ (463) | $ (790) | $ 0 |  |
Payment of contingent consideration |  | 337 | 0 | $ 0 |  |
Manatee Works, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 4,813 |  |  |  |  |
Cash paid in purchase price | 1,023 |  |  |  |  |
Contingent consideration liability | $ 3,790 | 2,200 | 3,000 |  |  |
Revaluation of contingent consideration |  | 463 | $ 790 |  |  |
Payment of contingent consideration |  | 337 |  |  |  |
Contingent consideration, current |  | 800 |  |  |  |
Contingent consideration, noncurrent |  | $ 1,400 |  |  |  |
Intangible assets, useful life | 5 years |  |  |  |  |
Scenario, Forecast [Member] | Manatee Works, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration, low range |  |  |  |  | $ 0 | $ 0
Contingent consideration, high range |  |  |  |  | $ 2,200 | $ 1,700

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