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Investments (Tables)
 6 Months Ended
Jun. 30, 2022
Investments [Abstract]  
Fair Value of the Company's Investments by Type
The following tables summarize the fair value of the Company’s investments by type. The estimated fair values of the Company’s fixed income investments are classified as Level 2 in the fair value hierarchy as defined in U.S. GAAP. These valuations are based on observable direct and indirect inputs, primarily quoted prices of similar, but not identical, instruments in active markets or quoted prices for identical or similar instruments in markets that are not active. These fair values are obtained from independent pricing services which utilize Level 2 inputs.
June 30, 2022
Amortized
Cost		Accrued
Interest		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Obligations of U.S. Government and its agencies$137,222 $135 $2 $(393)$136,966 
Corporate debt securities6,299 47 — (38)6,308 
Certificates of deposit1,644 8 — (14)1,638 
Total investments$145,165 $190 $2 $(445)$144,912 
December 31, 2021
Amortized
Cost		Accrued
Interest		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value
Obligations of U.S. Government and its agencies$4,043 $17 $— $(7)$4,053 
Corporate debt securities4,294 40 — (5)4,329 
Certificates of deposit1,652 8 — (1)1,659 
Total investments$9,989 $65 $— $(13)$10,041 
Schedule of the Maturity of Investments
The following table summarizes the scheduled maturity for the Company’s investments at June 30, 2022 and December 31, 2021:
June 30, 2022December 31, 2021
Maturing in one year or less$144,912 $3,212 
Maturing after one year through two years— 6,829 
Total investments$144,912 $10,041