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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Financial Assets Measured on a Recurring Basis
The classifications within the fair value hierarchy of our financial assets that were measured and recorded at fair value on a recurring basis were as follows (in thousands):
December 31, 2021
Level 1
Level 2
Total
Commercial paper$— $945,841 $945,841 
Corporate bonds— 540,978 540,978 
U.S. Treasury and government-sponsored enterprises— 33,945 33,945 
Municipal bonds— 12,904 12,904 
Total debt securities available-for-sale— 1,533,668 1,533,668 
Money market funds66,531 — 66,531 
Certificates of deposit— 119,056 119,056 
Total financial assets carried at fair value$66,531 $1,652,724 $1,719,255 
December 31, 2020
Level 1
Level 2
Total
Commercial paper$— $569,828 $569,828 
Corporate bonds— 548,757 548,757 
U.S. Treasury and government-sponsored enterprises— 208,554 208,554 
Municipal bonds— 28,762 28,762 
Total debt securities available-for-sale— 1,355,901 1,355,901 
Money market funds40,761 — 40,761 
Certificates of deposit— 60,004 60,004 
Total financial assets carried at fair value$40,761 $1,415,905 $1,456,666