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
Sep. 30, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]    
Property, plant, and equipment gross, excluding land $ 11,301 $ 10,551
Accumulated depreciation and amortization (7,122) (6,225)
Property, plant, and equipment net, excluding land 4,179 4,326
Land 171 152
Property, plant, and equipment, net 4,350 4,478
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 6,731 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 $ 1,711 $ 1,590