XML 36 R25.htm IDEA: XBRL DOCUMENT v3.20.2
Fair Value Measurement (Tables)
9 Months Ended
Sep. 30, 2020
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, 2020 and December 31, 2019 are classified based on the valuation technique level in the tables below (in thousands):
 September 30, 2020
 TotalLevel 1Level 2
Assets:   
Cash equivalents:   
U.S. treasury securities$307,673 $307,673 $— 
Money market funds202,522 202,522 — 
Short-term investments: 
Commercial paper204,058 — 204,058 
Corporate securities519,269 — 519,269 
Long-term investments:
Corporate securities456,741 — 456,741 
Agency bonds64,520 — 64,520 
Total assets measured and recorded at fair value$1,754,783 $510,195 $1,244,588 

 December 31, 2019
 TotalLevel 1Level 2
Assets:   
Cash equivalents:   
Money market funds$146,165 $146,165 $— 
Short-term investments:
Commercial paper7,489 — 7,489 
Corporate securities319,293 — 319,293 
U.S. treasury securities44,286 44,286 — 
Agency bonds10,006 — 10,006 
Long-term investments:
Corporate securities295,478 — 295,478 
Agency bonds15,005 — 15,005 
Total assets measured and recorded at fair value$837,722 $190,451 $647,271 
Fair Value Measurements, Nonrecurring
The carrying amounts and estimated fair values of the notes as of September 30, 2020 and December 31, 2019 are as follows (in thousands):
September 30, 2020December 31, 2019
 Carrying AmountEstimated Fair ValueCarrying AmountEstimated Fair Value
2026 notes$751,349 $1,000,000 $— $— 
2025 notes631,061 1,208,800 602,611 831,000 
2023 notes154,574 462,358 297,692 523,538 
Convertible senior notes, net$1,536,984 $2,671,158 $900,303 $1,354,538