Restrictions on Cash - Additional Information (Detail) - USD ($)		12 Months Ended
	Mar. 15, 2020	Dec. 31, 2021	Dec. 31, 2020
Restricted Cash And Cash Equivalents Items [Line Items]
Average cash reserve balances		$ 0	$ 0
Federal reserve reserve requirement ratios	0.00%
Minimum [Member]
Restricted Cash And Cash Equivalents Items [Line Items]
Low reserve tranche, reserve requirement ratio		3.00%
Maximum [Member]
Restricted Cash And Cash Equivalents Items [Line Items]
Low reserve tranche, reserve requirement ratio		10.00%