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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Financial instruments measured at fair value
The table below summarizes certain financial instruments measured at fair value that are included within the accompanying balance sheets, and their designation among the three fair value measurement categories (see Note 2(xiii)):
 June 30, 2021 Fair Value Measurements
 Level 1Level 2Level 3Total
Assets:
Money market funds$176,710 $— $— $176,710 
Equity warrant rights— — 1,076 1,076 
Total assets measured at fair value$176,710 $— $1,076 $177,786 
 December 31, 2020 Fair Value Measurements
 Level 1Level 2Level 3Total
Assets:
Money market funds$168,129 $168,129 
Total assets measured at fair value$168,129 $168,129 
Changes in fair value of derivative liability The following table sets forth a summary of the changes in fair value of the equity warrant rights presented in "other assets" on the accompanying Condensed Balance Sheets. The measurement of the equity warrant rights represents a Level 3 financial instrument:
Equity Warrant Rights, presented in "other assets" within the Condensed Consolidated Balance Sheets
Fair value as of December 31, 2020$— 
Initial fair value estimate of equity warrant rights upon issuance1,233 
Fair value as of March 31, 2021$1,233 
Revaluation of equity warrant rights upon achievement of first development milestone, included in "license fees" within the Condensed Statement of Operations for the three months ended June 30, 2021719 
Revaluation of equity warrant rights included in "other income (expense), net" within the Condensed Statement of Operations for the three months ended June 30, 2021(876)
Fair value as of June 30, 2021$1,076