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Fair Value Measurements
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables present the financial instruments that were measured at fair value on a recurring basis within the fair value hierarchy (in thousands):
 September 30, 2021
 Level 1Level 2Level 3Total
Money market funds $95,089 $— $— $95,089 
 December 31, 2020
 Level 1Level 2Level 3Total
Money market funds $127,567 $— $— $127,567 
Non-marketable debt security— — 1,000 1,000 
Total$127,567 $— $1,000 $128,567 
During the three and nine months ended September 30, 2021 and 2020, we did not recognize any significant credit losses nor other-than-temporary impairment losses on non-marketable securities.