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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - Institution	12 Months Ended
	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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- Definition

Concentration Risk, Credit Risk, Substantially All Cash, Financial Institutions, Number

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ References

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