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Revenue - Summary of Revenue Disaggregated by Geographic Markets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 387,864	$ 236,577	$ 149,805
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Major Customers [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	100.00%	100.00%	100.00%
Revenue Benchmark [Member] | Subscription and Service Concentration Risk [Member] | Major Customers [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	100.00%		100.00%
United States [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 246,676	$ 156,104	$ 101,709
United States [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	64.00%	66.00%	68.00%
International [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 141,188	$ 80,473	$ 48,096
International [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	36.00%	34.00%	32.00%
License [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 69,183	$ 49,043	$ 37,094
License [Member] | Revenue Benchmark [Member] | Subscription and Service Concentration Risk [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	18.00%	21.00%	25.00%
Post Contract Customer Support [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 183,737	$ 128,178	$ 78,664
Post Contract Customer Support [Member] | Revenue Benchmark [Member] | Subscription and Service Concentration Risk [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	47.00%	54.00%	52.00%
Confluent Cloud [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 94,179	$ 31,412	$ 14,448
Confluent Cloud [Member] | Revenue Benchmark [Member] | Subscription and Service Concentration Risk [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	24.00%	13.00%	10.00%
Subscription [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 347,099	$ 208,633	$ 130,206
Subscription [Member] | Revenue Benchmark [Member] | Subscription and Service Concentration Risk [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	89.00%	88.00%	87.00%
Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 40,765	$ 27,944	$ 19,599
Services [Member] | Revenue Benchmark [Member] | Subscription and Service Concentration Risk [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	11.00%	12.00%	13.00%

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