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Summary of Significant Accounting Policies - Accounts and Receivable and Allowance for Doubtful Accounts - Tabular Disclosure (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 6,320 | $ 3,486 | $ 1,090
Charged to Revenue | 13,349 | 7,742 | 3,414
Charged to Costs and Expenses | 5,562 | 1,606 | 824
Write-offs |  | (10) | (239)
Utilization | (10,201) | (6,504) | (1,603)
Balance at End of Period | 16,199 | 6,320 | 3,486
Cumulative Effect, Period of Adoption, Adjustment |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 1,169 |  |
Balance at End of Period |  | 1,169 |
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 2,771 | 1,175 | 590
Charged to Costs and Expenses | 5,562 | 1,606 | 824
Write-offs |  | (10) | (239)
Balance at End of Period | 9,502 | 2,771 | 1,175
Allowance for doubtful accounts | Cumulative Effect, Period of Adoption, Adjustment |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 1,169 |  |
Balance at End of Period |  | 1,169 |
Allowance for service changes and cancellations |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 3,549 | 2,311 | 500
Charged to Revenue | 13,349 | 7,742 | 3,414
Utilization | (10,201) | (6,504) | (1,603)
Balance at End of Period | $ 6,697 | $ 3,549 | $ 2,311

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