Revenue - Additional Information (Detail 1) $ in Millions	Dec. 31, 2018 USD ($)
Disaggregation Of Revenue [Line Items]
Revenue, remaining performance obligation	$ 7.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-07-01
Disaggregation Of Revenue [Line Items]
Revenue, remaining performance obligation	$ 2.9
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year