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Fair Value Measurements
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements
4. Fair Value Measurements
The following table summarizes the fair value of our financial assets that were measured on a recurring basis as of June 30, 2021 and December 31, 2020. There have been no transfers between fair value measurement levels during the six months ended June 30, 2021.
Fair Value Measurements at
June 30, 2021 Using
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Total
(in thousands)
Money market funds$265,000 $— $— $265,000 
Trading security— — 5,337 5,337 
Total assets$265,000 $— $5,337 $270,337 
Fair Value Measurements at
December 31, 2020 Using
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Total
(in thousands)
Money market funds$160,000 $— $— $160,000 
Trading security— — 5,238 5,238 
Total assets$160,000 $— $5,238 $165,238 
As of June 30, 2021 and December 31, 2020, the carrying value of our long-term debt approximates its estimated fair value as the interest rate on the debt agreements is adjusted for changes in the market rates. See Note 5. Debt for additional information regarding our debt.