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Note 14 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Mar. 31, 2024
Net operating loss carryforwards $ 150,703 $ 155,714
Research and development and other tax credit carryforwards 12,605 12,790
Capitalized research and development costs 5,787 3,514
Accruals and reserves 8,148 6,522
Fixed assets and intangible assets 398 639
Other 2,459 1,665
Gross deferred tax assets 180,100 180,844
Valuation allowance (171,674) (177,112)
Total deferred tax assets 8,426 3,732
Amortization (7,127) (1,492)
Other (1,716) (1,421)
Total deferred tax liabilities (8,843) (2,913)
Net deferred tax assets (liabilities) $ (417)  
Net deferred tax assets (liabilities)   $ 819