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Derivative Liability (Tables)
12 Months Ended
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Changes in Fair Value of Derivative Liability
Changes in the fair value of recurring measurements included in Level 3 of the fair value hierarchy are presented as other income (expense), net in our Statements of Operations and were as follows for the years ended December 31, 2021, 2020 and 2019 (in thousands):
202120202019
Fair value of exit fee derivative liability at January 1$1,376 $969 $533 
Change in estimated fair value of derivative liability$(678)$407 $436 
Fair value of exit fee derivative liability at December 31$698 $1,376 $969