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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 |

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