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Short-Term Investments (Tables)
9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of available for sale short-term investments
The following table represents the Company’s available for sale short-term investments by major security type (amounts in thousands):
September 30, 2021
Amortized
Cost
Gross Unrealized
Loss
Total
Fair Value
Short-term investments
U.S. government securities$206,948 $(1,827)$205,121 
Total short-term investments$206,948 $(1,827)$205,121 
December 31, 2020
Amortized
Cost
Gross Unrealized
Loss
Total
Fair Value
Short-term investments
U.S. government securities$177,614 $(63)$177,551 
Total short-term investments$177,614 $(63)$177,551