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Fair Value of Financial Assets and Liabilities
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets and Liabilities FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy used to determine such fair values:
Fair Value Measurements as of September 30, 2021 Using:
(in thousands)Level 1Level 2Level 3Total
Assets:
Cash equivalents—money market funds$34,816 $27,788 $— $62,604 
$34,816 $27,788 $— $62,604 
Liabilities: 
Embedded derivative liability$— $— $491 $491 
$— $— $491 $491 
Fair Value Measurements as of December 31, 2020 Using:
(in thousands)Level 1Level 2Level 3Total
Assets:
Cash equivalents—money market funds$16,816 $28,018 $— $44,834 
$16,816 $28,018 $— $44,834 
Liabilities:
Embedded derivative liability$— $— $455 $455 
$— $— $455 $455 

The Company’s cash equivalents consisted of money market funds invested in U.S. Treasury securities. The money market funds were valued based on reported market pricing for the identical assets, which represents a Level 1 measurement, or by using inputs observable in active markets for similar securities, which represents a Level 2 measurement.

The following table provides a roll-forward of the aggregate fair values financial instruments for which fair values are determined using Level 3 inputs:
(in thousands)Embedded Derivative Liability
Balance as of December 31, 2020$455 
Change in fair value36 
Balance as of September 30, 2021$491 
Embedded Derivative Liability The fair value of the embedded derivative liability recognized in connection with the Company’s loan agreement with Hercules (Note 7), which is associated with additional fees due to Hercules upon events of default, was determined based on significant inputs not observable in the market, which represents a Level 3 measurement within the fair value hierarchy. The fair value of this embedded derivative liability, which is reported within other non-current liabilities on the condensed consolidated balance sheets, is estimated by the Company at each reporting date based, in part, on the results of third party valuations, which are prepared based on a discounted cash flow model that considers the timing and probability of occurrence of a redemption upon an event of default, the potential amount of prepayment fees or contingent interest upon an event of default and the Company’s risk-adjusted discount rate of 14%.