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10. STOCK-BASED COMPENSATION - Weighted average assumptions (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Other information        
Income tax benefit recognized from allocation of share-based compensation expense     $ 0  
Windfall tax benefits realized     0  
Unrecognized compensation costs $ 5,200,000   $ 5,200,000  
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) $ 2.51 $ 2.66 $ 2.39 $ 2.84
Employee stock options        
Stock-based compensation        
Risk-free interest rate (as a percent) 0.38% 1.66%    
Risk-free interest rate, low end of range (as a percent)     0.22% 1.66%
Risk-free interest rate, high end of range (as a percent)     0.38% 2.30%
Expected life 5 years 5 years 5 years 5 years
Volatility (as a percent) 47.10% 36.50%    
Volatility, low end of range (as a percent)     41.90% 36.50%
Volatility, high end of range (as a percent)     47.10% 37.30%
Employee stock purchase plan options        
Stock-based compensation        
Risk-free interest rate (as a percent) 0.12% 1.58%    
Risk-free interest rate, low end of range (as a percent)     0.12% 1.58%
Risk-free interest rate, high end of range (as a percent)     0.15% 2.43%
Expected life 6 months 6 months 6 months 6 months
Volatility (as a percent) 68.60% 33.50%    
Volatility, low end of range (as a percent)     67.10% 33.50%
Volatility, high end of range (as a percent)     68.60% 43.10%