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Stock-Based Compensation - Assumptions Used Estimate Fair Value of Employee Stock Purchase Plans (Detail) - $ / shares
shares in Thousands
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]        
Shares purchased for offering period (in shares) 3,942 844 875 1,031
Fair value per share as of the beginning of the offering period (in dollars per share) $ 1.31 $ 0.47 $ 0.54 $ 0.70
Assumptions        
Risk-free interest rate (average) 5.40% 5.50% 5.00% 3.90%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Weighted average expected life (years) 6 months 6 months 6 months 6 months
Volatility (average) 111.10% 66.30% 88.00% 68.50%