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Commitments and Contingencies - Additional Information (Detail) € in Thousands, £ in Thousands, $ in Thousands | Sep. 08, 2014 complaint | May 16, 2014 patent | Mar. 31, 2018 USD ($) ft² | Mar. 31, 2018 GBP (£) ft² | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Nov. 30, 2017 EUR (€) | Nov. 30, 2017 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual base rent |  |  | $ 1,000 |  |  |  |  |
Tenant improvement allowances |  |  | 1,000 |  |  |  |  |
Unamortized lease incentives |  |  | 900 |  |  |  |  |
IDchecker |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual base rent |  |  |  |  | € 197 | $ 243 | € 48 | $ 59
Other current liabilities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Unamortized lease incentives |  |  | 100 |  |  |  |  |
Other non-current liabilities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Unamortized lease incentives |  |  | $ 700 |  |  |  |  |
Building |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Amended office space subject to the lease (in square feet) | ft² |  |  | 28,791 | 28,791 |  |  |  |
Sales Office |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual base rent |  |  | $ 88 | £ 63 |  |  |  |
RMII Patent Infringement Case |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of patents allegedly infringed (in patents) | patent |  | 4 |  |  |  |  |  |
Number of additional claims filed (in complaints) | complaint | 3 |  |  |  |  |  |  |

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