Summary of Significant Accounting Policies - Summary of Disaggregation of Revenue by Category (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Disaggregation of Revenue [Line Items] | |||
| Amount | $ 243,920 | $ 305,463 | $ 440,900 |
| Percentage of Revenue | 100.00% | 100.00% | 100.00% |
| Consumer services [Member] | |||
| Disaggregation of Revenue [Line Items] | |||
| Amount | $ 197,525 | $ 271,639 | $ 425,534 |
| Percentage of Revenue | 81.00% | 89.00% | 96.00% |
| Research services [Member] | |||
| Disaggregation of Revenue [Line Items] | |||
| Amount | $ 46,341 | $ 28,268 | $ 12,385 |
| Percentage of Revenue | 19.00% | 9.00% | 3.00% |
| Therapeutics [Member] | |||
| Disaggregation of Revenue [Line Items] | |||
| Amount | $ 54 | $ 5,556 | $ 2,981 |
| Percentage of Revenue | 0.00% | 2.00% | 1.00% |