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Inventories - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Inventory Disclosure [Abstract]        
Write-off of inventory $ 0 $ 1,000,000 $ 0 $ 1,792,000