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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount $ 9,432 $ 9,280
Intangible assets, Accumulated Amortization (8,578) (7,858)
Intangible assets, Net Book Value 854 1,422
Licenses    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount 4,422 4,422
Intangible assets, Accumulated Amortization (3,739) (3,328)
Intangible assets, Net Book Value $ 683 1,094
Intangible assets, Estimated Useful Life 7 years  
Core Technology And Know How    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Gross Amount $ 5,010 4,858
Intangible assets, Accumulated Amortization (4,839) (4,530)
Intangible assets, Net Book Value $ 171 $ 328
Core Technology And Know How | Minimum    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Estimated Useful Life 5 years  
Core Technology And Know How | Maximum    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Estimated Useful Life 10 years