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Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
The Company measures and reports certain cash equivalents, including money market funds and certificates of deposit, at fair value in accordance with the provisions of the authoritative accounting guidance that addresses fair value measurements. This guidance establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. The hierarchy is broken down into three levels based on the reliability of the inputs as follows:
Level 1:    Observable inputs that reflect unadjusted quoted prices in active markets for identical assets or liabilities.
Level 2:    Other inputs, such as quoted prices for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.
Level 3:    Unobservable inputs that are supported by little or no market activity and that are based on management’s assumptions, including fair value measurements determined by using pricing models, discounted cash flow methodologies or similar techniques.
The financial assets carried at fair value were determined using the following inputs (in thousands):
Fair Value at September 30, 2020Level 1Level 2Level 3
Cash equivalents:    
Money market funds$643,127 $643,127 $— $— 
Noncurrent assets:
Long-term investments$173,641 $— $— $173,641 
Fair Value at December 31, 2019Level 1Level 2Level 3
Cash equivalents:    
Money market funds$297,311 $297,311 $— $— 
Noncurrent assets:
Long-term investments$132,188 $— $— $132,188 
The Company’s other financial instruments, including accounts receivable, accounts payable, and other current liabilities, are carried at cost, which approximates fair-value due to the relatively short maturity of those instruments.
Convertible Senior Notes    
During the three months ended September 30, 2020, the Company issued $650 million aggregate principal amount 0% convertible senior notes due 2026 (the “2026 Notes”) as described in Note 6. As of September 30, 2020, the fair value of the 0% convertible senior notes due 2026 was approximately $644.6 million. The fair value was determined based on the quoted price for the 2026 Notes in an inactive market on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy.
As of September 30, 2020, the fair value of the 0% convertible senior notes due 2025 (the “2025 Notes”) was approximately $1.1 billion. The fair value was determined based on the quoted price for the 2025 Notes in an inactive market on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy.
As of September 30, 2020, the fair value of the 0% convertible senior notes due 2023 (the “2023 Notes”) was approximately $341.9 million. The fair value was determined based on the quoted price for the 2023 Notes in an inactive market on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy.
Long-Term Investments
As of September 30, 2020, the fair value of the Company's long-term investments in convertible and redeemable preferred stock was $173.6 million. The Company classifies its long-term investments as Level 3 in the fair value hierarchy based on the nature of the fair value inputs and judgment involved in the valuation process. The Company uses a lattice model to value these investments and relies on observable inputs including share-price, credit spread, and volatility. The model also incorporates judgments relating to the probability of special redemption triggers, the expected holding period of the investment and interest rates. These investments are reported at fair value in long-term investments in the Condensed Consolidated Balance Sheets. The Company's total net unrealized gain recorded in other income (expense), net, was $23.3 million and $38.6 million for the three and nine months ended September 30, 2020, respectively. Volatility in the global economic climate and financial markets, including the effects of COVID-19, could result in a significant change in the underlying share-price of the Company’s investees, resulting in a material change in the value of the long-term investments.