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Discontinued operations - Disposal of Discontinued Activity (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Net loss from discontinued operations | $ (21,124,000) | $ (21,500,000)
Red Violet, Inc. | Discontinued Operations, Disposed of |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Revenue | 3,325,000 | 8,578,000
Cost of revenue (exclusive of depreciation and amortization) | 2,017,000 | 7,066,000
Sales and marketing expenses | 1,089,000 | 4,394,000
General and administrative expenses | 1,852,000 | 17,480,000
Depreciation and amortization | 451,000 | 1,138,000
Loss from operations of discontinued operations, net of $0 income taxes | (2,084,000) | (21,500,000)
Loss on disposal of discontinued operations, net of $0 income taxes | (19,040,000) | 0
Net loss from discontinued operations |  | (21,500,000)
Tax effect of income (loss) from discontinued operation during phase-out period | 0 | 0
Tax effect gain (loss) from disposal of discontinued operation | $ 0 | $ 0

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