Summary of Significant Accounting Policies - Summary of Revenue by Region (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenue		$ 75,659	$ 55,204	$ 140,172	$ 114,443
Service
Disaggregation Of Revenue [Line Items]
Revenue	[1]	$ 75,659	$ 55,204	$ 140,172	$ 114,443
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Service
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		100.00%	100.00%	100.00%	100.00%
United States
Disaggregation Of Revenue [Line Items]
Revenue		$ 52,546	$ 38,613	$ 100,655	$ 78,965
United States | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		69.00%	70.00%	72.00%	69.00%
United Kingdom
Disaggregation Of Revenue [Line Items]
Revenue		$ 19,030	$ 12,335	$ 31,004	$ 26,240
United Kingdom | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		25.00%	22.00%	22.00%	23.00%
Canada
Disaggregation Of Revenue [Line Items]
Revenue		$ 2,839	$ 2,748	$ 5,878	$ 5,988
Canada | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		4.00%	5.00%	4.00%	5.00%
Other
Disaggregation Of Revenue [Line Items]
Revenue		$ 1,244	$ 1,508	$ 2,635	$ 3,250
Other | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		2.00%	3.00%	2.00%	3.00%
International
Disaggregation Of Revenue [Line Items]
Revenue		$ 23,113	$ 16,591	$ 39,517	$ 35,478
International | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		31.00%	30.00%	28.00%	31.00%

[1] There was no Therapeutics revenue for the three and six months ended September 30, 2022 and 2021.