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Investments - Summary of Gross Unrealized Losses and Fair Value of Investments in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value    
Less Than 12 Months $ 9,551 $ 213,777
Greater Than 12 Months 55,709 84,507
Total 65,260 298,284
Unrealized Loss    
Less Than 12 Months (26) (310)
Greater Than 12 Months (54) (33)
Total (80) (343)
Certificates of deposit    
Fair Value    
Less Than 12 Months 0 244
Greater Than 12 Months 0 0
Total 0 244
Unrealized Loss    
Less Than 12 Months 0 0
Greater Than 12 Months 0 0
Total 0 0
Corporate notes and bonds    
Fair Value    
Less Than 12 Months 6,053 117,271
Greater Than 12 Months 26,907 24,514
Total 32,960 141,785
Unrealized Loss    
Less Than 12 Months (24) (205)
Greater Than 12 Months (50) (9)
Total (74) (214)
U.S. Treasuries    
Fair Value    
Less Than 12 Months 0 5,041
Greater Than 12 Months 14,000 33,996
Total 14,000 39,037
Unrealized Loss    
Less Than 12 Months 0 (2)
Greater Than 12 Months (1) (17)
Total (1) (19)
U.S. Government agencies    
Fair Value    
Less Than 12 Months 3,498 91,221
Greater Than 12 Months 14,802 25,997
Total 18,300 117,218
Unrealized Loss    
Less Than 12 Months (2) (103)
Greater Than 12 Months (3) (7)
Total $ (5) $ (110)