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Discontinued operations - Disposal of Discontinued Activity (Detail) - USD ($)
 12 Months Ended
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