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, 2017
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]      
Property, plant, and equipment gross, excluding land $ 10,924 $ 10,551  
Accumulated depreciation (7,426) (6,225)  
Property, plant, and equipment net, excluding land 3,498 4,326  
Land 176 152  
Property, plant, and equipment, net 3,674 4,478 $ 3,727
Building      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross 220 196  
Leasehold Improvements      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross 2,005 2,003  
Equipment and Computers      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross 6,883 6,163  
Furniture and Fixtures      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross 634 599  
Construction in Progress      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, gross $ 1,182 $ 1,590