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Derivative Liability (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2021 and 2020 (in thousands):
Six Months Ended June 30,
20212020
Fair value of Exit Fee derivative liability at January 1$1,376 $969 
Change in estimated fair value of derivative liability(713)152 
Fair value of Exit Fee derivative liability at June 30$663 $1,121