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10. STOCK-BASED COMPENSATION - Weighted average assumptions (Details) - USD ($)
3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Other information    
Income tax benefit recognized from allocation of share-based compensation expense $ 0  
Windfall tax benefits realized 0  
Unrecognized compensation costs $ 4,700,000  
Weighted average period of recognition of unrecognized compensation costs 2 years 1 month 2 days  
Weighted average fair value per underlying share of options granted (in dollars per share) $ 1.67 $ 2.41
Employee stock options    
Stock-based compensation    
Risk-free interest rate, high end of range (as a percent) 2.95% 0.80%
Expected life 5 years 5 years
Volatility, high end of range (as a percent) 49.20% 47.70%
Employee stock purchase plan options    
Stock-based compensation    
Risk-free interest rate, high end of range (as a percent) 1.54% 0.04%
Expected life 6 months 6 months
Volatility, high end of range (as a percent) 49.30% 57.40%