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Stock-Based Compensation - Restricted Stock Units (Detail) - 2007 Plan [Member] - Restricted Stock Units (RSUs) [Member]
 3 Months Ended
Jun. 30, 2024
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested Shares, Beginning Balance | shares 726,084
Granted, Shares | shares 390,661
Vested, Shares | shares (153,000)
Forfeited, Shares | shares (15,000)
Unvested Shares, Ending Balance | shares 948,745
Unvested, Weighted-Average Grant-Date Fair Value, Beginning Balance | $ / shares $ 1.5
Granted, Weighted-Average Grant-Date Fair Value | $ / shares 0.66
Vested, Weighted-Average Grant-Date Fair Value | $ / shares 1.82
Forfeited, Weighted-Average Grant-Date Fair Value | $ / shares 0.95
Unvested, Weighted-Average Grant-Date Fair Value, Ending Balance | $ / shares $ 1.07