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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Summary of Placement in the Fair Value Hierarchy of Financial Assets that are Measured at Fair Value on a Recurring Basis
The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis as of September 30, 2021:
Quoted Prices in Active Markets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
September 30,
2021
Assets
U.S. government debt securities$— $139,345 $— $139,345 
Certificates of deposit— 265 — 265 
Total$— $139,610 $— $139,610 
The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis as of December 31, 2020:
Quoted Prices in Active Markets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
December 31,
2020
Assets
U.S. government debt securities$— $48,061 $— $48,061 
Certificates of deposit— 264 — 264 
Total$— $48,325 $— $48,325