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Available-for-Sale-Securities
6 Months Ended
Jun. 30, 2023
Debt Securities, Available-for-Sale [Abstract]  
Available-for-Sale-Securities Available-for-Sale-Securities
The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or marketable securities in our Consolidated Balance Sheets (in thousands):
June 30, 2023December 31, 2022
CostGross Unrealized GainsGross Unrealized LossesEstimated Fair ValueCostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Corporate debt securities$22,135 $$(14)$22,123 $44,308 $— $(17)$44,291 
Commercial paper10,640 — — 10,640 7,953 — — 7,953 
Money market funds8,309 — — 8,309 4,871 — — 4,871 
Agency bonds4,833 — (3)4,830 — — — — 
Treasury bills6,908 — (1)6,907 — — — — 
Municipal debt securities605 — — 605 7,626 — (1)7,625 
Total$53,430 $$(18)$53,414 $64,758 $— $(18)$64,740 


Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale securities in our Consolidated Balance Sheets (in thousands):
June 30, 2023December 31, 2022
Cash equivalents$19,478 $27,668 
Marketable securities33,936 37,072 
Total$53,414 $64,740 
The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
June 30, 2023
Amortized CostEstimated Fair Value
Less than one year$53,430 $53,414 
Greater than one year— — 
Total$53,430 $53,414