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Short-Term Investments
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Short-Term Investments Short-Term Investments
The following table represents the Company’s available for sale short-term investments by major security type (amounts in thousands):
December 31, 2021
Amortized
Cost
Gross Unrealized
Loss
Total
Fair Value
Short-term investments:
U.S. government securities$177,096 $(560)$176,536 
Total short-term investments$177,096 $(560)$176,536 
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 
The Company’s short-term investment instruments and cash and cash equivalents are classified using Level 1 inputs within the fair value hierarchy and are valued using quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. Debt securities have an average maturity of 0.43 years as of December 31, 2021.