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Development Derivative Liability (Tables)
6 Months Ended
Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Development Derivative Liability
The following table presents activity for the development derivative liability during the six months ended June 30, 2020 (in thousands):
Development
Derivative
Liability
Balance at December 31, 2019$—  
Initial payment, net of common stock warrants
2,075  
Funding during the period
8,449  
Change in fair value4,162  
Balance at June 30, 2020$14,686