Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Increase in revenue adjustment		$ 9,000,000.0
Decrease in net loss		$ 9,000,000.0
Decrease in net loss per share		$ 0.02
Revenue recognized	$ 46,600,000	$ 31,900,000
Total restricted cash	8,400,000	8,600,000
Impairment charges	0	0	$ 0
Impairment of long-lived assets	10,126,000	0	0
Finance leases	0
Advertising costs	49,100,000	54,700,000	11,200,000
Deferred Advertising Costs	1,600,000	700,000
K I T S
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Revenue recognized	27,700,000	21,900,000	24,100,000
Research Services
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Revenue recognized	9,700,000	31,400,000
Remaining performance obligations	21,600,000
Deferred revenue for customer services	14,000,000.0	11,600,000	31,900,000
Contract with customer liability revenue recognized related party amount	9,200,000	30,100,000
Consumer services
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Deferred revenue for customer services	$ 48,600,000	$ 51,300,000	$ 39,300,000
Employee Stock Purchase Plan
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Payroll deductions to participate in plan	15.00%
Employee Stock Purchase Plan \| Class A Common Stock [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Discount from market price, offering date	85.00%
Discount from market price, purchase date	85.00%
Maximum value of shares per employee	$ 25,000
Supplier Concentration Risk \| Revenue \| Microarrays
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of Revenue	100.00%	100.00%	100.00%
Supplier Concentration Risk \| Revenue \| K I T S
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of Revenue	100.00%	100.00%	100.00%
Supplier Concentration Risk \| Revenue \| Laboratory Services
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of Revenue	100.00%	100.00%	100.00%

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