Summary of Significant Accounting Policies - Summary of Revenue by Region (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Revenue		$ 66,940	$ 56,891	$ 207,112	$ 171,334
Service
Disaggregation Of Revenue [Line Items]
Revenue	[1]	$ 66,940	$ 56,891	$ 207,112	$ 171,334
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		$ 46,770	$ 41,741	$ 147,425	$ 120,706
United States | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		70.00%	73.00%	71.00%	70.00%
United Kingdom
Disaggregation Of Revenue [Line Items]
Revenue		$ 16,194	$ 10,779	$ 47,198	$ 37,020
United Kingdom | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		24.00%	19.00%	23.00%	22.00%
Canada
Disaggregation Of Revenue [Line Items]
Revenue		$ 2,866	$ 3,065	$ 8,744	$ 9,052
Canada | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		4.00%	6.00%	4.00%	5.00%
Other
Disaggregation Of Revenue [Line Items]
Revenue		$ 1,110	$ 1,306	$ 3,745	$ 4,556
Other | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		2.00%	2.00%	2.00%	3.00%

[1] There was no Therapeutics revenue for the three and nine months ended December 31, 2022 and 2021.