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Fair Value Measurements
 12 Months Ended
Dec. 31, 2020
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 at December 31, 2020 and 2019 by level within the fair value hierarchy (in thousands): 
 December 31, 2020
Level 1Level 2Level 3Total
Money market funds$127,567 $— $— $127,567 
Non-marketable debt securities$— $— $1,000 $1,000 
Total$127,567 $— $1,000 $128,567 

 
December 31, 2019
Level 1
Level 2
Level 3
Total
Money market funds$71,248 $— $— $71,248 

There were no investments in non-marketable debt and equity securities at December 31, 2019.
The fair value of non-marketable securities remeasured due to impairment would be classified within level 3.
During the year ended December 31, 2020, we did not recognize any significant other-than-temporary impairment losses. After the adoption of ASU 2016-13, we did not recognize any significant credit losses.