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STOCK BASED COMPENSATION (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
STOCK BASED COMPENSATION |
Summary of fair value of restricted stock units determined using the Black-Scholes option-pricing model with the weighted-average assumptions | ​
​ | ​ | ​ | ​
​ | ​ | 2021 |
Expected volatility |  | 75.00 | %
Risk-free interest rate |  | 0.72 | ​
Probability weighted time to exit |  | 5 | years
Expected dividend yield |  | 0 | ​
​
Employees |
STOCK BASED COMPENSATION |
Summary of activity related to restricted common stock | ​
​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | average
​ | ​ | ​ | ​ | grant-date
​ | ​ | Number of | ​ | fair value
​ | ​ | shares | ​ | per share
Beginning balance, January 1, 2020 |  | — |  | —
Granted |  | 380,500 |  | 1.26
Vested |  | (132,251) |  | 1.37
Canceled and forfeited |  | (22,000) |  | 0.93
Ending balance, December 31, 2020 |  | 226,249 |  | 1.22
Beginning balance, January 1, 2021 |  | 226,249 |  | 1.22
Granted |  | 136,000 |  | 1.42
Vested |  | (113,477) |  | 1.33
Canceled and forfeited |  | (96,625) |  | 1.23
Ending balance, December 31, 2021 |  | 152,147 |  | 1.31
Beginning balance, January 1, 2022 |  | 152,147 |  | 1.31
Granted |  | 204,625 |  | 3.82
Vested |  | (138,303) |  | 2.02
Canceled and forfeited |  | (10,250) |  | 1.26
Ending balance, December 31, 2022 |  | 208,219 |  | 3.30
Summary of total stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31, |  | December 31,
​ | ​ | 2022 | ​ | 2021 | ​ | 2020
Cost of revenues |  | 8,978 |  | 19,419 |  | 16,150
General and administrative expenses |  | 190,295 |  | 48,942 |  | 161,881
Selling and marketing expenses |  | 15,954 |  | 2,707 |  | 3,159
Total |  | 215,227 |  | 71,068 |  | 181,190
Summary of fair value of stock options determined using the Black-Scholes option-pricing model with the weighted-average assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 – July |  | 2021 – January |  | 2021 – July |  | 2021 – October |  | 2020 – August |
Expected volatility |  | 75.00 | % | 65.00 | % | 75.00 | % | 75.00 | % | 75.00 | %
Risk-free interest rate |  | 0.72 | % | 0.18 | % | 0.72 | % | 0.93 | % | 0.22 | %
Probability weighted time to exit |  | 3 | years | 3 | years | 5 | years | 5 | years | 4 | years
Expected dividend yield |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 | ​
Third-party consultant |
STOCK BASED COMPENSATION |
Summary of activity related to restricted common stock | ​
​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | average
​ | ​ | ​ | ​ | grant-date
​ | ​ | Number of | ​ | fair value
​ | ​ | shares | ​ | per share
Beginning balance, January 1, 2021 |  | — |  | —
Granted(*) |  | 60,232 |  | 1.96
Vested |  | (6,518) |  | 1.96
Ending balance, December 31, 2021 |  | 53,714 |  | 1.96
Beginning balance, January 1, 2022 |  | 53,714 |  | 1.96
Granted |  | 10,000 |  | 3.82
Vested |  | (10,680) |  | 2.51
Ending balance, December 31, 2022 |  | 53,034 |  | 2.20
(*) | 30,116 of these shares will vest on the occurrence of a public offering that is in compliance with the minimum stock price and gross proceeds defined in the service agreement with the consultant. The other 30,116 will vest over a four year period.
Summary of total stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31, |  | December 31,
​ | ​ | 2022 | ​ | 2021 | ​ | 2020
General and administrative expenses |  | 26,893 |  | 12,776 |  | —
Total |  | 26,893 |  | 12,776 |  | —
Summary of fair value of stock options determined using the Black-Scholes option-pricing model with the weighted-average assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |
Expected volatility |  | 75.00 | % | 75.00 | %
Risk-free interest rate |  | 0.72 |  | 0.93 | ​
Probability weighted time to exit |  | 3 | years | 5 | years
Expected dividend yield |  | 0 |  | 0 | ​

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