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Investments
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Short-term investments as of December 31, 2021, consist of the following (in thousands):
 
Adjusted
Cost		Unrealized
Gains		Unrealized
Losses		Fair
Value
Corporate bonds$146,032 $— $(30)$146,002 
Asset-backed bonds29,507 — (19)29,488 
Total short-term investments$175,539 $— $(49)$175,490 
 
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