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Summary of Significant Accounting Policies - Revenue - Contract Fulfillment Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Intake Costs asset |  |
Capitalized Contract Cost [Line Items] |  |
GROSS CARRYING AMOUNT | $ 71,336 | $ 63,721
ACCUMULATED AMORTIZATION | (42,678) | (33,352)
NET CARRYING AMOUNT | 28,658 | 30,369
Commissions asset |  |
Capitalized Contract Cost [Line Items] |  |
GROSS CARRYING AMOUNT | 114,791 | 91,069
ACCUMULATED AMORTIZATION | (50,553) | (38,787)
NET CARRYING AMOUNT | $ 64,238 | $ 52,282

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