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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |  |  |
Unsatisfied performance obligation | $ 90,500 |  | $ 90,500 |  |
Amount of remaining performance obligation | 80.00% |  | 80.00% |  |
Allowance for doubtful accounts | $ 3,200 |  | $ 3,200 |  | $ 4,400
Unearned revenue | 6,522 |  | 6,522 |  | $ 11,459
Prior year unearned revenue recognized in period |  |  | 7,000 |  |
Share-based compensation costs | $ 2,800 | $ 2,900 | $ 8,600 | $ 6,300 |
Antidilutive securities excluded from computation of Earnings Per Share, amount |  |  | 1.4 |  |

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