Annual report pursuant to Section 13 and 15(d)

Summary of Property, Plant, and Equipment (Detail)

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Summary of Property, Plant, and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land $ 8,952 $ 8,269  
Less: accumulated depreciation (8,049) (7,664)  
Total property, plant, and equipment, net before land 903 605  
Land 164 177  
Property, plant, and equipment, net 1,067 782 $ 1,193
Building      
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land 211 229  
Leasehold Improvements      
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land 89 52  
Equipment and Computers      
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land 8,150 7,477  
Furniture and Fixtures      
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land 471 465  
Construction in Progress      
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land $ 31 $ 46