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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value
Assets and liabilities measured at fair value at each balance sheet date are as follows (in thousands):
September 30, 2021
Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$350,803 $— $— $350,803 
U.S. government treasuries24,998 — — 24,998 
Short-term marketable securities:
U.S. government treasuries472,214 — — 472,214 
U.S. government agency securities— 15,003 — 15,003 
Corporate debt securities— 61,182 — 61,182 
Commercial paper— 96,223 — 96,223 
Long-term marketable securities:
U.S. government treasuries299,069 — — 299,069 
Corporate debt securities— 20,403 — 20,403 
Total$1,147,084 $192,811 $— $1,339,895 
Liabilities:
Foreign currency derivative contracts$— $201 $— $201 
Total$— $201 $— $201 
December 31, 2020
Level 1Level 2Level 3Total
Assets:
Cash equivalents:
Money market funds$335,284 $— $— $335,284 
U.S. government treasuries149,997 — — 149,997 
Short-term marketable securities:
U.S. government treasuries878,938 — — 878,938 
U.S. government agency securities— 25,217 — 25,217 
Corporate debt securities— 27,180 — 27,180 
Commercial paper— 31,218 — 31,218 
Long-term marketable securities:
U.S. government treasuries2,561 — — 2,561 
Corporate debt securities— 30,138 — 30,138 
Foreign currency derivative contracts— 185 — 185 
Total$1,366,780 $113,938 $— $1,480,718 
Liabilities:
Foreign currency derivative contracts$— $11 $— $11 
Total$— $11 $— $11