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6. FINANCIAL INSTRUMENTS (Details) - Recurring - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Fair value measurements    
Money market funds $ 3,801 $ 6,611
Marketable securities 30,632 34,297
Assets 34,433 40,908
Level 1    
Fair value measurements    
Money market funds 3,801 6,611
Assets 3,801 6,611
Level 2    
Fair value measurements    
Marketable securities 30,632 34,297
Assets 30,632 $ 34,297
Level 3    
Fair value measurements    
Assets $ 0