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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of assets measured at fair value on recurring basis
The following tables present financial assets and liabilities at September 30, 2021 and December 31, 2020 for which the Company measures fair value on a recurring basis, by level, within the fair value hierarchy:

September 30, 2021TotalLevel 1Level 2Level 3Valuation
Technique
Assets
Money market mutual funds$17,146 $17,146 $— $— (a)
December 31, 2020TotalLevel 1Level 2Level 3Valuation
Technique
Assets
Money market mutual funds$20,142 $20,142 $— $— (a)
United States treasuries4,999 4,999 — — (a)
(a)Market approach—prices and other relevant information generated by market transactions involving identical or comparable assets.