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, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land $ 10,153 $ 10,924  
Less: accumulated depreciation (8,344) (7,426)  
Total property, plant, and equipment, net before land 1,809 3,498  
Land 166 176  
Property, plant, and equipment, net 1,975 3,674 $ 4,478
Building      
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land 213 220  
Leasehold Improvements      
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land 2,004 2,005  
Equipment and Computers      
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land 7,277 6,883  
Furniture and Fixtures      
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land 634 634  
Construction in Progress      
Property Plant And Equipment [Line Items]      
Total property, plant, and equipment before depreciation and land $ 25 $ 1,182