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Available-for-Sale-Securities
12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [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 debt marketable securities in the Company's Consolidated Balance Sheets (in thousands):
December 31, 2021December 31, 2020
CostGross Unrealized GainsGross Unrealized LossesEstimated Fair ValueCostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Corporate debt securities$53,135 $— $(65)$53,070 $8,406 $— $(7)$8,399 
Money market funds18,124 — — 18,124 7,591 — — 7,591 
Municipal debt securities20,263 — (5)20,258 14,753 — (6)14,747 
Total$91,522 $— $(70)$91,452 $30,750 $— $(13)$30,737 
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 debt securities on the Company's Consolidated Balance Sheets (in thousands):
December 31, 2021December 31, 2020
Cash and cash equivalents$21,129 $12,676 
Marketable securities70,323 18,061 
Total$91,452 $30,737 

The following table summarizes the Company's portfolio of available-for-sale securities by contractual maturity (in thousands):
December 31, 2021December 31, 2020
Amortized CostEstimated Fair ValueAmortized CostEstimated Fair Value
Less than one year$91,522 $91,452 $30,750 $30,737 
Greater than one year— — — — 
Total$91,522 $91,452 $30,750 $30,737