Summary of Acquisition Related Finite-lived Intangibles and Estimated Lives (Detail) - 3VR $ in Thousands	Feb. 14, 2018 USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Gross Purchased Intangible Assets	$ 6,300
Trademarks
Acquired Finite Lived Intangible Assets [Line Items]
Gross Purchased Intangible Assets	$ 400
Estimated Useful Life (in Years)	5 years
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Purchased Intangible Assets	$ 2,900
Estimated Useful Life (in Years)	10 years
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Purchased Intangible Assets	$ 3,000
Estimated Useful Life (in Years)	10 years