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4. BALANCE SHEET DETAIL - Accrued expenses and other liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Accrued expenses and other liabilities:    
Accrued compensation $ 4,173 $ 3,673
Purchased intellectual property   1,621
Accrued commissions 217 270
Income taxes payable 198 143
Miscellaneous accrued expenses 932 871
Total accrued expenses and other liabilities $ 5,520 $ 6,578