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Derivative Liabilities (Tables)
9 Months Ended
Sep. 30, 2023
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 condensed statements of operations and comprehensive income (loss) and were as follows for the nine months ended September 30, 2023 and 2022 (in thousands):
20232022
Balance at January 1,$1,656 $698 
2022 Exit Fee addition at fair value— 375 
Changes in estimated fair value:
2018 Exit Fee273 (4)
2022 Exit Fee126 58 
Balance at September 30,$2,055 $1,127