Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 39,197 | $ 81,405 |
| Less: accumulated depreciation and amortization | (37,939) | (58,906) |
| Property and equipment, net | 1,258 | 22,499 |
| Computer equipment and software | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 2,713 | 7,347 |
| Laboratory equipment and software | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 34,681 | 34,539 |
| Furniture and office equipment | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 836 | 7,416 |
| Leasehold improvements | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 967 | 31,250 |
| Capitalized asset retirement obligations | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 0 | $ 853 |