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Summary of Significant Accounting Policies - Concentration Risk (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) item
Concentrations of risk |  |
Deferred revenue | $ 37,300,000 | $ 92,600,000
Accrued interest | 800,000 | 1,400,000
Impairment loss or recoveries | 0 | 0
Amounts on deposit in excess of federally insured limits approximately | $ 143,200,000 | $ 163,300,000
Minimum |  |
Concentrations of risk |  |
Collection period | 30 days |
Maximum |  |
Concentrations of risk |  |
Collection period | 60 days |
Accounts receivable | Customers | Major Customers |  |
Concentrations of risk |  |
Concentration risk percentage | 84.00% | 88.00%
Accounts receivable | Service providers |  |
Concentrations of risk |  |
Number of service providers | item | 2 | 2
Payables | Service providers |  |
Concentrations of risk |  |
Number of service providers | item | 4 | 1
Number of critical suppliers | item | 4 |
Payables | Service providers | Major Vendors |  |
Concentrations of risk |  |
Concentration risk percentage | 64.00% | 49.00%

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