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Development Derivative Liability (Tables)
3 Months Ended
Mar. 31, 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 three months ended March 31, 2020 (in thousands):
 
Development
Derivative
Liability
Balance at December 31, 2019
$

Initial payment, net of common stock warrants
2,075

Funding during the period
557

Change in fair value
454

Balance at March 31, 2020
$
3,086