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Operating Leases - Narrative (Detail)
 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
ft²
Location
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Operating Leased Assets [Line Items]      
Area of operating lease | ft² 42,400    
Number of office space locations | Location 2    
Total future lease payments due $ 5,933,000    
Contractual reimbursement of lease payments expected over life of lease $ 200,000    
Operating lease expense excluding rent     $ 300,000
Lease Forecast      
Operating Leased Assets [Line Items]      
Operating lease expense excluding rent   $ 400,000