Annual report pursuant to Section 13 and 15(d)

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

v3.20.1
Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 51,398 $ 48,968
Less - accumulated depreciation and amortization 33,811 31,897
Property, plant and equipment, net 17,587 17,071
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 171 171
Buildings and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 19,393 19,263
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 30,474 29,530
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,360 $ 4