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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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Unamortized lease incentives.

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Area of land held.

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- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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Number of another entity's patents that the entity has allegedly infringed.

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- Definition

Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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