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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Unsatisfied performance obligation | $ 60,200 |  |
Amount of remaining performance obligation | 91.00% |  |
Allowance for doubtful accounts | $ 4,815 |  | $ 4,371
Unearned revenue | 8,120 |  | $ 11,459
Prior year unearned revenue recognized in period | 2,700 |  |
Share-based compensation costs | $ 5,800 | $ 3,400 |

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