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Commitments and Contingencies (Details) € in Thousands, £ in Thousands, ft² in Thousands | Jun. 11, 2018 USD ($) | Jun. 11, 2018 EUR (€) | May 03, 2018 USD ($) | Dec. 31, 2018 USD ($) ft² | Dec. 31, 2018 GBP (£) ft² | Dec. 31, 2018 EUR (€) ft²
--- | --- | --- | --- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |  |  |  |
Annual base rent |  |  |  | $ 1,000,000.0 |  |
Tenant improvement allowances |  |  |  | 1,000,000.0 |  |
Unamortized lease incentives |  |  |  | 800,000 |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 10,000,000.0 |  |  |
Interest rate floor |  |  | 4.50% |  |  |
Minimum unrestricted cash and unused borrowing capacity |  |  | $ 15,000,000.0 |  |  |
Adjusted quick ratio requirement |  |  | 1.75 |  |  |
Borrowings outstanding |  |  |  | 0 |  |
Line of Credit | Revolving Credit Facility | Prime Rate |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.25% |  |  |
Other current liabilities |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Unamortized lease incentives |  |  |  | 100,000 |  |
Other non-current liabilities |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Unamortized lease incentives |  |  |  | 600,000 |  |
United Kingdom |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Annual base rent |  |  |  | $ 80,000 | £ 63 |
Building |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Office space subject to the lease (in square feet) | ft² |  |  |  | 29 | 29 | 29
A2iA | France |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Annual base rent |  |  |  | $ 400,000 |  | € 400
A2iA | United States |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Annual base rent |  |  |  | 300,000 |  |
IDchecker | Netherlands |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Annual base rent |  |  |  | 200,000 |  | 200
ICAR | Spain |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Annual base rent |  |  |  | $ 100,000 |  | € 100
Pending Litigation | Global Equity & Corporate Consulting, S.L. | ICAR |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency, amount claimed | $ 900,000 | € 800 |  |  |  |

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