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Stock-Based Compensation - Assumptions Used Estimate Fair Value of Employee Stock Purchase Plans (Detail) - $ / shares
shares in Thousands
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Share-Based Payment Arrangement [Abstract]        
Shares purchased for offering period (in shares) 7,000 8,250 10,901 6,019
Fair value per share (in dollars per share) $ 0.54 $ 0.70 $ 1.15 $ 1.61
Assumptions        
Risk-free interest rate (average) 4.99% 3.92% 0.86% 0.05%
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) 88.00% 27.80% 32.50% 43.10%