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Capital Stock and Warrants (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Information with regard to outstanding warrants to purchase common stock
The following table summarizes information with regard to outstanding warrants to purchase common stock as of December 31, 2021:
IssuanceNumber of Common Shares Issuable Upon Exercise of Outstanding WarrantsExercise PriceExpiration Date
November 2019 Public Offering - Series A352,703 $8.00 May 19, 2022
November 2019 Public Offering - Series B395,528 $8.00 May 19, 2027
November 2019 Private Placement - Series A718,750 $8.00 May 19, 2022
November 2019 Private Placement - Series B718,750 $8.00 May 19, 2027
December 2017 Public Offering - Series A160,975 $90.00 December 21, 2022
July 2017 Registered Direct Offering14,270 $201.60 January 7, 2024
Consultant750 $116.00 September 11, 2024
Total2,361,726 
Schedule of primary rights of convertible preferred stockholders, and common stock shares reserved for future issuance The following shares of common stock were reserved for future issuance upon exercise of stock options, vesting of Restricted Stock Units ("RSUs") and conversion of outstanding warrants:
December 31, 2021December 31, 2020
Stock Options722,765 339,108 
RSUs9,430 8,500 
Warrants2,361,726 2,843,699 
Total number of common shares reserved for future issuance3,093,921 3,191,307