Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Available-for-Sale Debt Securities in an Unrealized Loss Position (Details)

v3.20.1
Basis of Presentation and Summary of Significant Accounting Policies - Available-for-Sale Debt Securities in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Gross Unrealized Losses    
Less than 12 months $ (3,337) $ (19)
12 months or greater 0 0
Total (3,337) (19)
Estimated Fair Value    
Less than 12 months 365,723 137,947
12 months or greater 0 0
Total 365,723 137,947
Bank deposits    
Gross Unrealized Losses    
Less than 12 months (1,398) (3)
12 months or greater 0 0
Total (1,398) (3)
Estimated Fair Value    
Less than 12 months 214,597 58,584
12 months or greater 0 0
Total 214,597 58,584
Corporate bonds    
Gross Unrealized Losses    
Less than 12 months (1,666)  
12 months or greater 0  
Total (1,666)  
Estimated Fair Value    
Less than 12 months 40,460  
12 months or greater 0  
Total 40,460  
Commercial paper    
Gross Unrealized Losses    
Less than 12 months (273) (16)
12 months or greater 0 0
Total (273) (16)
Estimated Fair Value    
Less than 12 months 110,666 79,363
12 months or greater 0 0
Total $ 110,666 $ 79,363