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Fair Value of Financial Assets and Liabilities
3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets and Liabilities Fair Value of Financial Assets and Liabilities The Company held no financial assets measured at fair value on a recurring basis as of March 31, 2020, or December 31, 2019.
The following tables present information about the Company's financial liability measured at fair value on a recurring basis and indicate the level of the fair value hierarchy utilized to determine such fair value:
Fair Value Measurement as of March 31, 2020 Using:
Level 1Level 2Level 3Total
Liabilities:
Derivative liability$—  $—  $650  $650  
$—  $—  $650  $650  


Fair Value Measurement as of December 31, 2019 Using:
Level 1Level 2Level 3Total
Liabilities:
Derivative liability$—  $—  $37,690  $37,690  
$—  $—  $37,690  $37,690  

The following table provides a roll forward of the aggregate fair value of the Company’s derivative liability (see Note 9) for which fair value is determined by Level 3 inputs for the three months ended March 31, 2020 and 2019:
Derivative
Liability
Balance at December 31, 2019$37,690  
Change in fair value5,781  
Partial settlement of derivative liability(42,821) 
Balance at March 31, 2020$650  

The Company held no financial assets or liabilities for which fair value is determined by Level 3 inputs for the three months ended March 31, 2019.
Valuation of Derivative Liability
The fair value of the derivative liability recognized in connection with the Series A preferred shares agreement with RPI Finance Trust ("RPI"), as described in Note 9, 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 the derivative liability relates to certain scenarios outlined in the agreement that would result in accelerated payments as compared to the agreement's host instrument. The with-and-without valuation method was used to determine the fair value of the embedded derivatives within the agreement.
As inputs into the valuation, the Company considered the type and probability of occurrence of certain events, the amount of the payments, the expected timing of certain events, and a risk-adjusted discount rate using credit spreads of biopharmaceutical companies in similar stages of development to the Company. In accordance with ASC 815, Derivatives and Hedging, the fair value of the derivative was recorded on the balance sheet as a derivative liability with changes in fair value recorded in other income (expense) in the condensed consolidated statements of operations and comprehensive loss. If factors change and different assumptions are used, the fair value of the derivative liability and the recorded gains or losses due to the change in the fair value could be materially different in the future.
Upon the FDA's approval of NURTEC ODT the Company remeasured the derivative using the inputs noted above. The Company settled the derivative liability associated with this approval of $42,821, which modified the timing of the payment obligation related to the redeemable preferred share liability.
Valuation of Liability Related to Sale of Future Royalties
In June 2018, and as described in Note 8, the Company entered into a funding agreement with RPI, accounted for as a liability financing. As of March 31, 2020, the fair value of the liability related to sale of future royalties, used in determining the effective interest rate of the liability, is based on the Company's current estimates of future royalties expected to be paid to RPI over the life of the arrangement, which is considered Level 3.