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AVAILABLE-FOR-SALE SECURITIES (Tables)
9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Investments by Major Security Type
The following table represents the Company’s available-for-sale investments by major security type as of September 30, 2021 and December 31, 2020 (in thousands):

September 30, 2021
Amortized CostGross Unrealized GainsGross Unrealized LossesTotal Fair Value
Commercial Paper$83,732 $$(12)$83,723 
Corporate Bonds94,978 17 (21)94,974 
Municipal Bonds5,883 — (5)5,878 
Total$184,593 $20 $(38)$184,575 

December 31, 2020
Amortized CostGross Unrealized GainsGross Unrealized LossesTotal Fair Value
Commercial Paper$— $— $— $— 
Corporate Bonds— — — — 
Municipal Bonds— — — — 
Total$— $— $— $— 
Schedule of Fair Value and Amortized Cost Bases of Available-for-sale Investments by Maturity Date
The following table summarizes the fair value and amortized cost bases of the Company’s available-for-sale investments by contractual maturity of September 30, 2021 and December 31, 2020 (in thousands):

September 30, 2021December 31, 2020
Amortized CostFair ValueAmortized CostFair Value
Due within one year$125,538 $125,524 $— $— 
Due after one year through five years59,055 59,051 — — 
Total$184,593 $184,575 $— $—