Revenue - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) Segment
Revenue From Contract With Customer [Line Items]
Number of operating segments | Segment	2
Remaining performance obligations | $	$ 1.8
Minimum
Revenue From Contract With Customer [Line Items]
Payment period from contract inception	30 days
Maximum
Revenue From Contract With Customer [Line Items]
Payment period from contract inception	90 days
Hardware Products | Minimum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	30 days
Hardware Products | Maximum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	60 days
Software Licenses | Minimum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	30 days
Contract period	1 year
Software Licenses | Maximum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	60 days
Contract period	3 years
Software Maintenance and Support Services | Minimum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	30 days
Contract period	1 year
Software Maintenance and Support Services | Maximum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	60 days
Contract period	3 years
Extended Hardware Warranties | Minimum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	30 days
Contract period	1 year
Extended Hardware Warranties | Maximum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	60 days
Contract period	2 years