Equity Incentive Plan - Summary of The Black-Scholes Assumptions Used To Value Stock Options At The Grant Dates (Detail) |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Maximum | |||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Expected term (years) | 6 years 1 month 6 days | 6 years 1 month 6 days | 6 years 3 months 18 days |
| Expected volatility | 68.00% | 62.00% | 54.00% |
| Risk-free interest rate | 0.50% | 2.20% | 3.10% |
| Expected dividend yield | 0.00% | 0.00% | 0.00% |
| Minimum | |||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Expected term (years) | 4 years | 5 years | 5 years |
| Expected volatility | 61.00% | 53.00% | 52.00% |
| Risk-free interest rate | 0.20% | 0.60% | 2.50% |
| Expected dividend yield | 0.00% | 0.00% | 0.00% |