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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 |

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