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Subsequent Events - Additional Information (Detail) - USD ($)
 12 Months Ended
Jan. 10, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 09, 2018
Feb. 12, 2018
Subsequent Event [Line Items]            
Proceeds from issuance of shares, net of issuance costs     $ 10,079,000 $ 59,180,000    
Long-term debt   $ 62,963,000 $ 50,013,000      
COGINT, INC. [Member] | Red Violet, Inc. [Member]            
Subsequent Event [Line Items]            
Spinoff description   On March 9, 2018, in order to meet NASDAQ initial listing requirement of a minimum $4.00 bid price, the Company adjusted the Spin-off ratio so that on the Distribution Date, stockholders of the Company will receive, by way of a dividend, one share of Red Violet common stock for each 7.5 shares of cogint common stock held as of the Record Date.        
Subsequent Event [Member] | Red Violet, Inc. [Member]            
Subsequent Event [Line Items]            
Cash           $ 20,000,000
Long-term debt           $ 0
Common stock, dividend shares for spin-off         1  
Subsequent Event [Member] | Red Violet, Inc. [Member] | Minimum [Member]            
Subsequent Event [Line Items]            
Bid price required to meet NASDAQ initial listing         $ 4.00  
Subsequent Event [Member] | COGINT, INC. [Member]            
Subsequent Event [Line Items]            
Common stock, dividend shares for spin-off         7.5  
Subsequent Event [Member] | Securities Purchase Agreement [Member]            
Subsequent Event [Line Items]            
Proceeds from issuance of shares, net of issuance costs $ 13,500,000          
Warrant to purchase common stock 1,350,000          
Exercise price of warrants $ 6.00          
Subsequent Event [Member] | Securities Purchase Agreement [Member] | Common Stock [Member]            
Subsequent Event [Line Items]            
Issuance of shares, net of offering costs, shares 2,700,000          
Common stock purchase price per share $ 5.00