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Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Balance, beginning of year | $ 9,049 | $ 7,296 | $ 4,486
Add: provision for doubtful accounts | 10,515 | 9,129 | 7,353
Less: write-offs, net of recoveries and other adjustments | (7,314) | (7,376) | (4,543)
Balance, end of year | 12,711 | 9,049 | 7,296
Cumulative Effect, Period of Adoption, Adjustment | ASC 326 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Balance, beginning of year | $ 461 | 0 | 0
Balance, end of year |  | $ 461 | $ 0

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