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10. STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Stock-based compensation expense by line item        
Stock-based compensation expense $ 693 $ 629 $ 2,101 $ 1,922
Cost of revenues        
Stock-based compensation expense by line item        
Stock-based compensation expense 88 77 260 184
Research and development        
Stock-based compensation expense by line item        
Stock-based compensation expense 343 347 1,109 1,143
Selling, general and administrative        
Stock-based compensation expense by line item        
Stock-based compensation expense $ 262 $ 205 $ 732 $ 595