Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 48,889 $ 47,900
Less - accumulated depreciation and amortization 31,837 30,879
Property, plant and equipment, net 17,052 17,021
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 19,066 18,818
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 29,579 28,854
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 34 $ 18