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Discontinued operations - Disposal of Discontinued Activity (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Major classes of line items constituting loss from discontinued operations:        
Loss from operations of discontinued operations, net of $0 income taxes $ 0 $ 0 $ 0 $ (2,084,000)
Loss on disposal of discontinued operations, net of $0 income taxes 0 0 0 (19,040,000)
Net loss from discontinued operations 0 0 0 (21,124,000)
Discontinued operation, tax effect of gain (loss) from disposal of discontinued operation $ 0 $ 0 $ 0 0
Discontinued Operations, Disposed of | Red Violet, Inc.        
Major classes of line items constituting loss from discontinued operations:        
Revenue       3,325,000
Cost of revenue (exclusive of depreciation and amortization)       2,017,000
Sales and marketing expenses       1,089,000
General and administrative expenses       1,852,000
Depreciation and amortization       451,000
Loss from operations of discontinued operations, net of $0 income taxes       (2,084,000)
Loss on disposal of discontinued operations, net of $0 income taxes       (19,040,000)
Net loss from discontinued operations       (21,124,000)
Discontinued operation, tax effect of income (loss) from discontinued operation during phase-out period       0
Discontinued operation, tax effect of gain (loss) from disposal of discontinued operation       $ 0