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Segment Information - Accounts Receivable Balances (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Accounts receivable, net $ 9,308,624 $ 10,743,505
Reis Services [Member]    
Segment Reporting Information [Line Items]    
Accounts receivable 9,568,000 10,862,000
Allowance for doubtful accounts (259,000) (118,000)
Accounts receivable, net $ 9,309,000 $ 10,744,000