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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 10, 2018
USD ($)
Dec. 22, 2017
Nov. 03, 2017
shares
Sep. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment
Customer
Supplier
Dec. 31, 2016
USD ($)
Customer
Supplier
Dec. 31, 2015
USD ($)
Customer
Supplier
Feb. 27, 2018
USD ($)
Dec. 31, 2014
USD ($)
Summary Of Significant Accounting Policies [Line Items]                    
Net loss from continuing operations           $ (53,206,000) $ (29,086,000) $ (42,585,000)    
Net loss from discontinued operations attributable to cogint           0 0 (41,950,000)    
Net cash provided by (used in) operating activities           2,352,000 2,099,000 (10,673,000)    
Accumulated deficit           167,437,000 114,231,000      
Cash and bank deposits           16,629,000 10,089,000 13,462,000   $ 5,996,000
Net increase in cash and cash equivalents           6,540,000 (3,373,000) 7,466,000    
Costs and expenses           262,786,000 220,874,000 58,491,000    
FDIC Insurance limit           250,000        
Allowance for doubtful accounts           1,852,000 790,000 318,000   $ 105,000
Write-off of Purchased IP and capitalized litigation costs       $ 4,055,000 $ 3,626,000   4,055,000      
Impairment of long lived assets           $ 0 0      
Acquisition consideration payable in stock             10,225,000      
Deferred revenue recognition period           1 year        
Deferred revenue           $ 298,000 318,000      
Advertising and promotion costs           $ 2,818,000 $ 4,027,000 $ 388,000    
U.S. corporate statutory income tax rate   21.00%       34.00% 34.00% 34.00%    
Operating segments | Segment           2        
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Customer One [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Major customers | Customer           0 1 1    
Concentration risk           10.00% 12.00% 14.00%    
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Major customers | Customer           0 0      
Concentration risk           10.00% 10.00%      
Supplier Concentration Risk [Member] | Cost of Revenues [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Major customers | Supplier           0 1 1    
Concentration risk           10.00% 15.00% 11.00%    
Supplier Concentration Risk [Member] | Trade Accounts Payable [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Concentration risk             10.00%      
Number of major suppliers | Supplier           1 0      
Supplier Concentration Risk [Member] | Trade Accounts Payable [Member] | Media Supplier One [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Concentration risk           11.00%        
Minimum [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Estimated useful life of intangible assets           2 years        
Maximum [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Estimated useful life of intangible assets           20 years        
Fluent Acquisition [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Cash and bank deposits           $ 15,134,000        
Q Interactive​, LLC [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Acquisition consideration payable in stock             $ 10,225,000      
Common stock to be issued to settle the acquisition consideration | shares     2,750,000              
United States [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Cash and bank deposits           $ 16,629,000 10,089,000      
Previously Issued [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Costs and expenses             $ 87,076,000 $ 48,238,000    
Subsequent Event [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Additional debt capital $ 13,500,000                  
Subsequent Event [Member] | Red Violet, Inc. [Member]                    
Summary Of Significant Accounting Policies [Line Items]                    
Cash contribution will be made based upon spin-off                 $ 20,000,000