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Common stock and convertible preferred stock (Tables)
12 Months Ended
Dec. 31, 2021
Common stock and convertible preferred stock  
Schedule of warrants outstanding

At December 31, 2021 common stock warrants outstanding were as follows:

Warrants

    

Exercise Price per Share

Expiration Date

803,112

$ 9.00

June 2, 2023

500,000

$ 45.00

April 28, 2024