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11. STOCK-BASED COMPENSATION - Weighted average assumptions (Details) - USD ($)
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Stock-based compensation      
Expected life 5 years    
Dividend yield (as a percent) 0.00%    
Other information      
Income tax benefit recognized from allocation of share-based compensation expense $ 0 $ 0  
Windfall tax benefits realized 0 $ 0  
Unrecognized compensation costs $ 5,300,000    
Weighted average period of recognition of unrecognized compensation costs 2 years 4 days    
Weighted average fair value per underlying share of options granted (in dollars per share) $ 2.55 $ 2.86 $ 2.44
Employee stock options      
Stock-based compensation      
Risk-free interest rate, low end of range (as a percent) 0.22% 1.35% 2.53%
Risk-free interest rate, high end of range (as a percent) 0.42% 2.30% 2.91%
Expected life 5 years 5 years 5 years
Volatility, low end of range (as a percent) 41.90% 36.50% 35.60%
Volatility, high end of range (as a percent) 47.60% 39.70% 37.30%
Employee stock purchase plan options      
Stock-based compensation      
Risk-free interest rate, low end of range (as a percent) 0.12% 1.58% 2.09%
Risk-free interest rate, high end of range (as a percent) 0.15% 2.43% 2.50%
Expected life 6 months 6 months 6 months
Volatility, low end of range (as a percent) 67.10% 33.50% 32.60%
Volatility, high end of range (as a percent) 68.60% 43.10% 37.70%