v3.20.4
Fair Value of Financial Assets and Liabilities (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
The following table summarizes the estimated fair value of our financial instruments which are measured at fair value on a recurring basis:
Estimated fair value
Fair value
hierarchy
December 31, 2020December 31, 2019
Assets:
Money market funds1,469 
Marketable equity securities19 
Derivative instruments-assets18 10 
Liabilities:
Derivative instruments-liabilities— (1)