Summary of Significant Accounting Policies - Summary of Revenue by Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Revenue	$ 55,204	$ 51,804	$ 114,443	$ 99,861
Consumer services
Disaggregation Of Revenue [Line Items]
Revenue	44,488	40,556	92,338	75,287
Research Services
Disaggregation Of Revenue [Line Items]
Revenue	10,716	11,248	22,105	24,526
Therapeutics
Disaggregation Of Revenue [Line Items]
Revenue	0	0	0	48
Service
Disaggregation Of Revenue [Line Items]
Revenue	$ 55,204	$ 51,804	$ 114,443	$ 99,861
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Consumer services
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	81.00%	78.00%	81.00%	75.00%
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Research Services
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	19.00%	22.00%	19.00%	25.00%
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Therapeutics
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	0.00%	0.00%	0.00%	0.00%
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Service
Disaggregation Of Revenue [Line Items]
Percentage of Revenue	100.00%	100.00%	100.00%	100.00%