Inventory - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Inventory Disclosure [Abstract]
Write-down of inventory	$ 823,000	$ 1,400,000	$ 983,000	$ 1,400,000