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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair value hierarchy of assets and liabilities
Assets and Liabilities at Fair Value
TotalNAV Practical Expedient (No Fair Value Level)Level 1Level 2Level 3
September 30, 2021
Assets
Money market funds$97,859 $— $97,859 $— $— 
Equity securities47,792 10,372 37,420 — — 
December 31, 2020
Assets
Money market funds$25,855 $— $25,855 $— $— 
Equity securities3,656 57 3,599 — —