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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Mar. 31, 2023
Deferred tax assets:    
Net operating loss carryovers $ 46,463 $ 43,603
Basis differences in property and equipment 0 0
Research and development credit carryforwards 0 3,591
Stock based compensation 2,962 2,986
Operating lease Right-of-Use asset 64 73
Capitalized research and development costs 10,188 8,215
Deferred revenue 460 643
Accruals and reserves 404 146
Total deferred tax assets 60,541 59,256
Valuation allowance (60,521) (59,251)
Total deferred tax assets net of valuation allowance 20 5
Deferred tax liabilities:    
Basis differences in property and equipment (20) (5)
Total deferred tax liabilities (20) (5)
Net deferred tax asset (liability) $ 0 $ 0