Summary of Significant Accounting Policies - Additional information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounting Policies [Abstract]
Inventory Write-down	$ 100	$ 100	$ 100	$ 200
Cash, FDIC insured amount	$ 250		$ 250