Balance Sheet Components - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Inventory [Line Items]
Long-term inventories	$ 70,439		$ 56,096
Long-term prepaid manufacturing	900		$ 4,700
Charge for reserve on excess and obsolescence of inventories	2,110	$ 3,945
Cost of Sales
Inventory [Line Items]
Charge for reserve on excess and obsolescence of inventories	$ 2,100	$ 3,900