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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - Institution | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk [Line Items] |  |  |
Number of financial institutions where substantially all of the cash is maintained | 1 |  |
Accounts Receivable | Credit Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk (as a percent) | 28.00% | 31.00% | 48.00%
Accounts Receivable | Credit Concentration Risk | Largest customer |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk (as a percent) | 14.00% | 17.00% | 25.00%
Accounts Receivable | Credit Concentration Risk | Second largest customer |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk (as a percent) | 17.00% | 14.00% | 13.00%
Accounts Receivable | Credit Concentration Risk | Third largest customer |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk (as a percent) |  |  | 10.00%

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