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Common stock and convertible preferred stock (Tables)
6 Months Ended
Jun. 30, 2021
Common stock and convertible preferred stock  
Schedule of warrants outstanding

At June 30, 2021 common stock warrants outstanding were as follows:

Warrants

    

Exercise Price per Share

Expiration Date

862,181

$ 9.00

June 2, 2023

500,000

$ 45.00

April 28, 2024