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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |  |  |
Unsatisfied performance obligation | $ 85,900 |  | $ 85,900 |  |
Amount of remaining performance obligation | 86.00% |  | 86.00% |  |
Allowance for doubtful accounts | $ 2,900 |  | $ 2,900 |  | $ 4,400
Unearned revenue | 8,948 |  | 8,948 |  | $ 11,459
Prior year unearned revenue recognized in period |  |  | 10,000 |  |
Share-based compensation costs | $ 2,000 | $ 2,600 | $ 10,600 | $ 8,900 |
Antidilutive securities excluded from computation of Earnings Per Share, amount |  |  | 1.4 |  |

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