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Summary of Significant Accounting Policies - Accounts Receivable, net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts Receivable, net |  |  |
Bad debt expense | $ 0 | $ 0 | $ 0
Accounts receivable | Credit concentration | One customer |  |  |
Accounts Receivable, net |  |  |
Largest concentrations of credit for any one customer | 8.00% | 11.00% |

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