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Spin-off of Red Violet and business combinations - Additional Information (Details) $ / shares in Units, $ in Thousands					3 Months Ended		12 Months Ended
	Mar. 19, 2018	Mar. 08, 2018 shares	Nov. 03, 2017 USD ($) shares	Jun. 08, 2016 shares	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 09, 2018 $ / shares	Feb. 12, 2018 USD ($)
Business Acquisition [Line Items]
Reverse stock split ratio	0.1333
Write-off of long-lived assets						$ 3,626	$ 1,517	$ 3,626
Q Interactive​, LLC
Business Acquisition [Line Items]
Stock issued related to merger (in shares) | shares			2,750,000
Common stock shares to be issued for additional contingent consideration payment | shares			2,750,000
Consideration transferred			$ 21,431
Common Stock | Q Interactive​, LLC
Business Acquisition [Line Items]
Stock issued related to merger (in shares) | shares				2,369,190
General and Administrative Expenses
Business Acquisition [Line Items]
Restructuring charges								$ 780
Trade Names And Acquired Proprietary Technology
Business Acquisition [Line Items]
Write-off of long-lived assets						$ 3,626
Spin-off Red Violet
Business Acquisition [Line Items]
Accelerated share-based compensation expense					$ 15,500
Red Violet, Inc. | Spin-off Red Violet
Business Acquisition [Line Items]
Cash contributed										$ 19,700
Red Violet, Inc. | Spin-off Red Violet | Minimum
Business Acquisition [Line Items]
Bid price required to meet NASDAQ initial listing (in dollars per shares) | $ / shares									$ 4.00
Red Violet, Inc. | Spin-off Red Violet | RSUs and Share Options
Business Acquisition [Line Items]
Approved accelerated aggregate number of shares, subject to certain requirement (in shares) | shares		5,157,998

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