Annual report pursuant to Section 13 and 15(d)

Balance Sheet Account Details - Available-for-Sale Debt Securities in an Unrealized Loss Position (Details)

v3.20.4
Balance Sheet Account Details - Available-for-Sale Debt Securities in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Gross Unrealized Losses    
Less than 12 months $ (3) $ (19)
12 months or greater 0 0
Total (3) (19)
Estimated Fair Value    
Less than 12 months 26,232 137,946
12 months or greater 0 0
Total 26,232 137,946
Bank deposits    
Gross Unrealized Losses    
Less than 12 months (1) (3)
12 months or greater 0 0
Total (1) (3)
Estimated Fair Value    
Less than 12 months 14,013 58,584
12 months or greater 0 0
Total 14,013 58,584
Corporate bonds    
Gross Unrealized Losses    
Less than 12 months (1)  
12 months or greater 0  
Total (1)  
Estimated Fair Value    
Less than 12 months 4,526  
12 months or greater 0  
Total 4,526  
Commercial paper    
Gross Unrealized Losses    
Less than 12 months (1) (16)
12 months or greater 0 0
Total (1) (16)
Estimated Fair Value    
Less than 12 months 7,693 79,362
12 months or greater 0 0
Total $ 7,693 $ 79,362