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Commitments and Contingencies - Indemnification and loss contingencies (Details) |  |  |  | 5 Months Ended |  |
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Feb. 14, 2018 item | Jan. 13, 2016 | Sep. 01, 2015 | Mar. 22, 2016 complaint | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($)
Indemnification clauses |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Liabilities accrued |  |  |  |  | $ 0 |
Office of Foreign Assets Control |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Liabilities accrued |  |  |  |  |  | $ 900,000
Transaction period under review |  | 5 years |  |  |  |
Office of Foreign Assets Control | Minimum |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Range of potential penalties assessed |  |  |  |  | $ 0 |
Pending Litigation |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Number of new claims filed | complaint |  |  |  | 2 |  |
Pending Litigation | Linda J. Rossbach v. Vasco Data Security International, Inc., et al. |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Number of days allowed to file amended complaint |  |  | 60 days |  |  |
Pending Litigation | Vortex Pathway LLC (a Texas non-practicing entity) v. VASCO Data Security International, Inc. et. al. | Subsequent Event |  |  |  |  |  |
Contingencies |  |  |  |  |  |
Number of hardware authenticators claimed to have infringed on patent rights | item | 1 |  |  |  |  |

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