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Summary of Significant Accounting Policies - Summary of Concentration Risk (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Service revenue percentage | Customer A
Concentration Risk [Line Items]
Concentration risk	27.00%	33.00%	27.00%	33.00%
Service revenue percentage | Customer B
Concentration Risk [Line Items]
Concentration risk	11.00%	11.00%	11.00%	13.00%
Accounts receivable percentage | Customer A
Concentration Risk [Line Items]
Concentration risk			26.00%		22.00%
Accounts receivable percentage | Customer B
Concentration Risk [Line Items]
Concentration risk			13.00%		16.00%

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