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Common Stock Warrants (Tables)
9 Months Ended
Sep. 30, 2021
Stockholders' Equity Note [Abstract]  
Schedule of fair value of the warrants
Risk-free interest rate  0.77%-1.01%
Expected life  5 years
Dividend yield  0%
Volatility  67%

 

Schedule of outstanding warrants to purchase common stock
Issuance Date  

Number of

Shares Issuable Upon

Exercise of

Outstanding

Warrants

   

Exercise

Price

   

Expiration

Date

5/4/2017     3,860     $ 3.10      5/3/2022
6/14/2017     1,351     $ 3.10      6/13/2022
8/30/2018     3,088     $ 3.10      8/29/2023
9/30/2018     60,506     $ 3.10      9/29/2023
9/30/2018     486,486     $ 2.16      9/29/2023
10/17/2018     1,157     $ 3.10      10/16/2023
11/2/2018     964     $ 3.10      11/1/2023
11/9/2018     964     $ 3.10      11/8/2023
11/16/2018     964     $ 3.10      11/15/2023
11/29/2018     964     $ 3.10      11/28/2023
12/21/2018     964     $ 3.10      12/20/2023
12/27/2018     964     $ 3.10      12/26/2023
1/31/2019     1,930     $ 3.10      1/30/2024
2/7/2019     1,640     $ 3.10      2/6/2024
2/21/2019     1,640     $ 3.10      2/20/2024
3/20/2019     3,378     $ 3.10      3/18/2024
4/8/2019     1,930     $ 3.10      4/6/2024
11/19/2020     53,333     $ 4.10      11/19/2023
11/19/2020     8,533     $ 4.10      11/19/2023
1/8/2021     13,333     $ 4.10      6/30/2024
1/11/2021     26,666     $ 4.10      6/30/2024
2/13/2021     13,333     $ 4.10      6/30/2024
3/16/2021     10,665     $ 4.10      6/30/2024
3/16/2021     13,333     $ 4.10      6/30/2024
8/31/2021     3,519,000     $ 4.25     8/30/2026
8/31/2021     153,000     $ 4.675     8/30/2026
9/29/2021     9,450     $ 4.675     8/30/2026
      4,393,396