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Discontinued operations - Reconciliation of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Current assets of discontinued operations | $ 0 | $ 2,274
Non-current assets of discontinued operations | $ 0 | 24,089
Red Violet, Inc. | Spin-off Red Violet |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash and cash equivalents |  | 65
Accounts receivable, net |  | 1,650
Prepaid expenses and other current assets |  | 559
Current assets of discontinued operations |  | 2,274
Property and equipment, net |  | 1,091
Intangible assets, net |  | 15,353
Goodwill |  | 6,465
Other non-current assets |  | 1,180
Non-current assets of discontinued operations |  | 24,089
Total assets of discontinued operations |  | 26,363
Trade accounts payable |  | 919
Accrued expenses and other current liabilities |  | 6,437
Deferred revenue |  | 33
Total liabilities of discontinued operations |  | $ 7,389

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