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6. INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Deferred tax assets:    
Tax credits $ 6,975 $ 5,512
Net operating losses 2,980 1,245
Stock-based compensation 1,180 950
Property and equipment 807 731
Other reserves and accruals 1,267 976
Total deferred tax assets 13,209 9,414
Valuation allowance (13,017) (9,389)
Total deferred tax assets 192 25
Deferred tax liabilities:    
Leased assets (186)  
Unrecognized gains (15) (32)
Total deferred tax liabilities (201) (32)
Net deferred tax liability 9 $ 7
Deferred tax liabilities, undistributed foreign earnings $ 0