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Significant Accounting Policies - Accounts and Receivable and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at Beginning of Period | $ 3,486 | $ 1,090
Charged to Revenue | 6,536 | 3,414
Charged to Costs and Expenses | 1,331 | 824
Write-offs |  | (239)
Utilization | (3,772) | (1,603)
Balance at End of Period | 7,581 | 3,486
Allowance for doubtful accounts |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at Beginning of Period | 1,175 | 590
Charged to Costs and Expenses | 1,331 | 824
Write-offs |  | (239)
Balance at End of Period | 2,506 | 1,175
Allowance for service changes and cancellations |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at Beginning of Period | 2,311 | 500
Charged to Revenue | 6,536 | 3,414
Utilization | (3,772) | (1,603)
Balance at End of Period | $ 5,075 | $ 2,311

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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