Inventories - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
Inventory Disclosure [Abstract] | |||
Amounts credited to the allowance for obsolete inventory | $ 0.3 | $ 0.5 | $ 0.2 |
Items charged to the allowance for inventory write-offs | $ 0.1 | $ 0.3 | $ 0.6 |