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Derivative Liability (Tables)
9 Months Ended
Sep. 30, 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, net in our statements of operations and were as follows for the nine months ended September 30, 2021 and 2020 (in thousands):
Nine Months Ended September 30,
20212020
Fair value of Exit Fee derivative liability at January 1$1,376 $969 
Change in estimated fair value of Exit Fee derivative liability(696)290 
Fair value of Exit Fee derivative liability at September 30$680 $1,259