Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail)

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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Mar. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 47,591 $ 46,711
Less - accumulated depreciation and amortization 28,844 26,899
Property, plant and equipment, net 18,747 19,812
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 210 210
Buildings and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 18,774 18,682
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 28,537 27,749
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 70 $ 70