Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Continuous Unrealized Loss Position (Details)

v3.20.1
Marketable Securities - Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Fair Value $ 320,429
Gross Unrealized Losses (3,319)
Corporate debt securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 304,859
Gross Unrealized Losses (3,301)
Municipal securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 2,891
Gross Unrealized Losses (9)
U.S. Government agency securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 10,669
Gross Unrealized Losses (8)
U.S. Treasury securities  
Debt Securities, Available-for-sale [Line Items]  
Fair Value 2,010
Gross Unrealized Losses $ (1)