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8. STOCK- BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Stock-based compensation expense by line item        
Stock-based compensation expense $ 429 $ 414 $ 1,359 $ 1,387
Other information        
Income tax benefit recognized from allocation of share-based compensation expense 0 0 0 0
Windfall tax benefits recognized 0 0 0 0
Unrecognized compensation costs 3,400   $ 3,400  
Weighted average period of recognition of unrecognized compensation costs     2 years 2 months 23 days  
Cost of revenues        
Stock-based compensation expense by line item        
Stock-based compensation expense 78 85 $ 209 242
Research and development        
Stock-based compensation expense by line item        
Stock-based compensation expense 251 208 712 649
Selling, general and administrative        
Stock-based compensation expense by line item        
Stock-based compensation expense $ 100 $ 121 $ 438 $ 496