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Business Overview - Additional Information (Detail)
9 Months Ended
Sep. 30, 2016
USD ($)
Item
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]  
Number of commercial products | Item 9
Revolving Line of Credit [Member]  
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]  
Maximum borrowing capacity $ 50,000,000
Borrowing base 40,400,000
Unfunded standby letter of credit outstanding 8,800,000
Accrued interest 100,000
Available borrowing capacity $ 31,500,000