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10. STOCK-BASED COMPENSATION - Weighted average assumptions (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Other information        
Income tax benefit recognized from allocation of share-based compensation expense     $ 0  
Windfall tax benefits realized     0  
Unrecognized compensation costs $ 5,700,000   $ 5,700,000  
Weighted average period of recognition of unrecognized compensation costs     2 years 1 month 17 days  
Weighted average fair value per underlying share of options granted (in dollars per share) $ 2.41 $ 2.51 $ 2.36 $ 2.39
Employee stock options        
Stock-based compensation        
Risk-free interest rate (as a percent) 1.20% 0.38%    
Risk-free interest rate, low end of range (as a percent)     0.66% 0.22%
Risk-free interest rate, high end of range (as a percent)     1.20% 0.38%
Expected life 5 years 5 years 5 years 5 years
Volatility (as a percent) 49.10% 47.10%    
Volatility, low end of range (as a percent)     47.70% 41.90%
Volatility, high end of range (as a percent)     49.10% 47.10%
Employee stock purchase plan options        
Stock-based compensation        
Risk-free interest rate (as a percent) 0.07% 0.12%    
Risk-free interest rate, low end of range (as a percent)     0.04% 0.12%
Risk-free interest rate, high end of range (as a percent)     0.07% 0.15%
Expected life 6 months 6 months 6 months 6 months
Volatility (as a percent) 45.60% 68.60%    
Volatility, low end of range (as a percent)     45.60% 67.10%
Volatility, high end of range (as a percent)     57.40% 68.60%