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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 |  |  |  |  |

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