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7. STOCK- BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Stock-based compensation expense by line item        
Stock-based compensation expense $ 414 $ 390 $ 1,387 $ 1,533
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 2,900   $ 2,900  
Weighted average period of recognition of unrecognized compensation costs     2 years 4 days  
Cost of revenues        
Stock-based compensation expense by line item        
Stock-based compensation expense 85 93 $ 242 296
Research and Development Expense        
Stock-based compensation expense by line item        
Stock-based compensation expense 208 220 649 709
Selling, general and administrative        
Stock-based compensation expense by line item        
Stock-based compensation expense $ 121 $ 77 $ 496 $ 528