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Investments
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Short-term investments as of September 30, 2021, consist of the following (in thousands):
 
Adjusted
Cost		Unrealized
Gains		Unrealized
Losses		Fair
Value
Corporate bonds$149,606 $1 $(12)$149,595 
Government bonds15,499 — — 15,499 
Asset-backed bonds22,559 1 (1)22,559 
Total short-term investments$187,664 $2 $(13)$187,653 
 
Short-term investments as of December 31, 2020, consist of the following (in thousands):

Adjusted
Cost		Unrealized
Gains		Unrealized
Losses		Fair
Value
Corporate bonds$55,224 $5 $(2)$55,227 
Government bonds14,121 2 — 14,123 
Asset-backed bonds3,514 — — 3,514 
Total short-term investments$72,859 $7 $(2)$72,864