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Operating Leases - Narrative (Detail) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2014
sqft
Location
Dec. 31, 2013
Dec. 31, 2015
Lease Forecast
sqft
Dec. 31, 2014
Lease Forecast
Operating Leased Assets [Line Items]        
Area of operating lease 36,800   42,200  
Operating Lease Expense Excluding Rent   $ 245,000   $ 334,000
Number of office space locations 3      
Total future lease payments due 6,420,000      
Contractual Reimbursement of Lease Payments Expected Over Life of Lease $ 294,000