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Fair Value Measurement
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurement Fair Value Measurement
Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability.
The Company classifies fair value measurements in one of the following three categories for disclosure purposes:
Level 1:    Quoted prices in active markets for identical assets or liabilities.
Level 2:    Inputs other than Level 1 prices for similar assets or liabilities that are directly or indirectly observable in the marketplace.
Level 3:    Unobservable inputs that are supported by little or no market activity and values determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant judgment or estimation.
The Company’s cash equivalents are classified using Level 1 inputs within the fair value hierarchy because they are valued using quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. None of the Company’s non-financial assets or liabilities are recorded at fair value on a non-recurring basis. No transfers between levels have occurred during the periods presented.
The fair value of the Company's financial commitment to SFJ in conjunction with the SFJ Agreement is presented as a development derivative liability based on Level 3 inputs.
The following table summarizes the Company’s assets and liabilities that require fair value measurements on a recurring basis and their respective input levels based on the fair value hierarchy (in thousands):

Total
Fair Value Measurements at Reporting Date
Level 1
Level 2
Level 3
As of September 30, 2021:
Assets
Cash equivalents$56,107 $56,107 $— $— 
Liabilities
Development derivative liability (Note 8)$94,037 $— $— $94,037 
As of December 31, 2020:
Assets
Cash equivalents$27,872 $27,872 $— $— 
Liabilities
Development derivative liability (Note 8)$51,719 $— $— $51,719