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10. STOCK-BASED COMPENSATION - Weighted average assumptions (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Other information    
Income tax benefit recognized from allocation of share-based compensation expense $ 0  
Windfall tax benefits realized 0  
Unrecognized compensation costs $ 4,500  
Weighted average period of recognition of unrecognized compensation costs 2 years 11 days  
Weighted average fair value per underlying share of options granted (in dollars per share) $ 2.80 $ 2.70
Employee stock options    
Stock-based compensation    
Risk-free interest rate, high end of range (as a percent) 0.36% 2.30%
Expected life 5 years 5 years
Volatility, high end of range (as a percent) 41.90% 37.30%
Employee stock purchase plan options    
Stock-based compensation    
Risk-free interest rate, high end of range (as a percent) 0.15% 2.43%
Expected life 6 months 6 months
Volatility, high end of range (as a percent) 67.10% 43.10%