Summary of Significant Accounting Policies - Summary of Revenue by Region (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2022	Jun. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenue		$ 64,513	$ 59,239
Service
Disaggregation Of Revenue [Line Items]
Revenue	[1]	$ 64,513	$ 59,239
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | Service
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		100.00%	100.00%
United States
Disaggregation Of Revenue [Line Items]
Revenue		$ 48,108	$ 40,352
United States | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		75.00%	68.00%
United Kingdom
Disaggregation Of Revenue [Line Items]
Revenue		$ 11,975	$ 13,906
United Kingdom | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		19.00%	23.00%
Canada
Disaggregation Of Revenue [Line Items]
Revenue		$ 3,039	$ 3,240
Canada | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		4.00%	6.00%
Other
Disaggregation Of Revenue [Line Items]
Revenue		$ 1,391	$ 1,741
Other | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		2.00%	3.00%
International
Disaggregation Of Revenue [Line Items]
Revenue		$ 16,405	$ 18,887
International | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Disaggregation Of Revenue [Line Items]
Percentage of Revenue		25.00%	32.00%

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