Quarterly report pursuant to Section 13 or 15(d)

Property, Plant, and Equipment - Additional Information (Detail)

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Property, Plant, and Equipment - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property Plant And Equipment [Line Items]        
Depreciation expense $ 251,000 $ 160,000 $ 540,000 $ 477,000
Leasehold Improvements        
Property Plant And Equipment [Line Items]        
Construction in progress 114,000   114,000  
Tenant Improvement Allowance        
Property Plant And Equipment [Line Items]        
Construction in progress 398,000   398,000  
Operating and Information Technology Equipment        
Property Plant And Equipment [Line Items]        
Construction in progress $ 577,000   $ 577,000