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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Financial Assets Carried at Fair Value
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