Quarterly report pursuant to Section 13 or 15(d)

Summary of Property, Plant, and Equipment (Detail)

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Summary of Property, Plant, and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property, plant, and equipment gross, excluding land $ 10,930 $ 10,924
Accumulated depreciation and amortization (7,935) (7,426)
Property, plant, and equipment net, excluding land 2,995 3,498
Land 169 176
Property, plant, and equipment, net 3,164 3,674
Building    
Property Plant And Equipment [Line Items]    
Property, plant, and equipment gross, excluding land 217 220
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property, plant, and equipment gross, excluding land 2,005 2,005
Equipment and Computers    
Property Plant And Equipment [Line Items]    
Property, plant, and equipment gross, excluding land 6,884 6,883
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Property, plant, and equipment gross, excluding land 634 634
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property, plant, and equipment gross, excluding land $ 1,190 $ 1,182