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Fair Value Measurement (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Financial instruments measured and recorded at fair value on a recurring basis as of September 30, 2021 and December 31, 2020 are classified based on the valuation technique level in the tables below (in thousands):
 September 30, 2021
 TotalLevel 1Level 2
Assets:   
Cash equivalents:   
Money market funds$684,499 $684,499 $— 
Short-term investments: 
Commercial paper364,143 — 364,143 
Corporate debt securities658,683 — 658,683 
Agency bonds15,519 — 15,519 
Long-term investments:
Corporate debt securities813,500 — 813,500 
Total assets measured and recorded at fair value$2,536,344 $684,499 $1,851,845 

 December 31, 2020
 TotalLevel 1Level 2
Assets:   
Cash equivalents:   
Money market funds$464,799 $464,799 $— 
Short-term investments:
Commercial paper204,170 — 204,170 
Corporate debt securities461,397 — 461,397 
Long-term investments:
Corporate debt securities484,597 — 484,597 
Agency bonds39,031 — 39,031 
Total assets measured and recorded at fair value$1,653,994 $464,799 $1,189,195 
Fair Value Measurements, Nonrecurring
The carrying amounts and estimated fair values of the notes as of September 30, 2021 and December 31, 2020 are as follows (in thousands):
September 30, 2021
December 31, 2020 (1)
 Carrying AmountEstimated Fair ValueCarrying AmountEstimated Fair Value
2026 notes$987,027 $984,880 $761,930 $1,129,370 
2025 notes689,722 1,011,050 640,614 1,456,800 
2023 notes— — 104,378 376,949 
Convertible senior notes, net$1,676,749 $1,995,930 $1,506,922 $2,963,119 
(1) Prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method. Refer to Note 7, “Convertible Senior Notes” for more information.