Marketable Securities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Marketable Securities [Line Items]
Marketable securities	$ 405,600	$ 395,100
Marketable securities unrealized loss, Less than twelve months	1,311,600	280,300,000
Marketable securities unrealized loss, more than twelve months	4,600	0
Unrealized loss, net			$ 0
Other Comprehensive Income (Loss) [Member]
Marketable Securities [Line Items]
Unrealized loss, net	$ 5,000.0	$ 100,000