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Fair Value Measurements
 6 Months Ended
Jun. 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):
 June 30, 2021
 Level 1Level 2Level 3Total
Money market funds $111,083 $— $— $111,083 
Non-marketable debt security— — 1,289 1,289 
     Total$111,083 $— $1,289 $112,372 
 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 
The fair value of non-marketable securities remeasured due to impairment would be classified within Level 3. During the three and six months ended June 30, 2021 and 2020, we did not recognize any significant credit losses nor other-than-temporary impairment losses on non-marketable securities. The carrying value of our non-marketable securities approximated fair value.