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Marketable Securities
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
The Company's investments in marketable securities are stated at fair value and are available-for-sale. The following table summarizes the Company's investments in marketable securities (in thousands):

Available-for-Sale Securities at
March 31, 2022
MaturityAmortized Cost BasisGross Unrealized LossesFair Value
Short-term marketable securities
U.S. Treasury notesWithin one year$188,665 $(527)$188,138 
U.S. Government-sponsored enterprise securitiesWithin one year78,375 (700)77,675 
Total short-term marketable securities$267,040 $(1,227)$265,813 
Long-term marketable securities
U.S Treasury notesWithin two years$11,040 $(72)$10,968 
U.S. Government-sponsored enterprise securitiesWithin two years22,044 (288)21,756 
Total long-term marketable securities$33,084 $(360)$32,724 
Available-for-Sale Securities at
 December 31, 2021
MaturityAmortized Cost BasisGross Unrealized LossesFair Value
Short-term marketable securities
U.S. Treasury notesWithin one year$226,136 $(344)$225,792 
U.S. Government-sponsored enterprise securitiesWithin one year49,618 (70)49,548 
Total short-term marketable securities$275,754 $(414)$275,340 
Long-term marketable securities
U.S Treasury notesWithin two years$— $— $— 
U.S. Government-sponsored enterprise securitiesWithin two years64,596 (200)64,396 
Total long-term marketable securities$64,596 $(200)$64,396 

The cost of securities sold is based upon the specific identification method. Interest receivable related to the marketable securities of $1.3 million was included within prepaid expenses and other current assets on the accompanying Consolidated Balance Sheets as of March 31, 2022.

Interest income totaled $1.6 million the three months ended March 31, 2022 (nil for the three months ended March 31, 2021) and is included in "Interest and dividend income" in the Consolidated Statements of Operations.

Future maturities of the Company's marketable securities are $207.0 million in 2022 and $91.5 million in 2023.