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Investments
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Short-term investments as of June 30, 2021, consist of the following (in thousands):
 
Adjusted
Cost		Unrealized
Gains		Unrealized
Losses		Fair
Value
Corporate bonds$162,484 $5 $(9)$162,480 
Government bonds29,859 — (1)29,858 
Asset-backed bonds17,840 — — 17,840 
Total short-term investments$210,183 $5 $(10)$210,178 
 
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