Certain Financial Statement Caption Information - Additional information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Schedule Of Available For Sale Securities [Line Items]
Other than temporary impairment loss investments available for sale securities	$ 0	$ 0
Minimum
Schedule Of Available For Sale Securities [Line Items]
Available for sale Securities debt maturities period	1 year
Maximum
Schedule Of Available For Sale Securities [Line Items]
Available for sale Securities debt maturities period	2 years