Property and Equipment, Net - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Depreciation expenses	$ 12,508,000	$ 9,282,000	$ 3,410,000
Property, plant and equipment additions	44,644,000	119,184,000	44,451,000
Non-cash finance lease asset	0	4,617,000	114,000
General Office Space and Equipment [Member]
Property Plant And Equipment [Line Items]
Depreciation expenses	2,720,000	1,783,000	149,000
Construction-in-Process [Member]
Property Plant And Equipment [Line Items]
Capitalized interest	2,467,000	652,000	158,000
Cost of Sales [Member]
Property Plant And Equipment [Line Items]
Depreciation expenses	$ 4,932,000	$ 4,242,000	$ 1,964,000