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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Summary of financial instruments measured at fair value on a recurring basis
The following tables present the financial instruments that were measured at fair value on a recurring basis within the fair value hierarchy (in thousands):
 March 31, 2021
 Level 1Level 2Level 3Total
Money market funds $122,075 $— $— $122,075 
Non-marketable debt security— 1,067 1,067 
     Total$122,075 $— $1,067 $123,142 

 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