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Summary of Significant Accounting Policies - Revenue - Contract Fulfillment Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Intake Costs asset |  |
Capitalized Contract Cost [Line Items] |  |
GROSS CARRYING AMOUNT | $ 63,721 | $ 41,224
ACCUMULATED AMORTIZATION | (33,352) | (23,579)
NET CARRYING AMOUNT | 30,369 | 17,645
Commissions asset |  |
Capitalized Contract Cost [Line Items] |  |
GROSS CARRYING AMOUNT | 91,069 | 68,008
ACCUMULATED AMORTIZATION | (38,787) | (27,178)
NET CARRYING AMOUNT | $ 52,282 | $ 40,830

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