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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2022
STOCKHOLDERS' DEFICIT |
Schedule of common stock reserved for future issuance in connection with the conversion of shares of Preferred Stock and upon the exercise of certain options and warrants | ​
​ | ​ | ​
Preferred stock: |  |
Series A‑1 |  | 152,188
Series A‑2 |  | 675,638
Series A‑3 |  | 712,198
Series A‑4 |  | 148,834
Series A‑5 |  | 868,487
Series A‑6 |  | 953,163
Series B |  | 8,059,581
Series B‑1 |  | 1,936,284
Series B‑2 |  | 706,243
​ |  | 14,212,616
Warrants: |  |
Warrants to purchase Series A‑5 preferred stock |  | 5,010
Warrants to purchase Series A‑6 preferred stock |  | 6,179
Warrants to purchase Series B preferred stock |  | 42,354
Warrants to purchase Series B‑3 preferred stock |  | 2,824,974
​ |  | 2,878,517
Stock options: |  |
Stock options outstanding |  | 1,671,075
Stock options available for future grant |  | 432,413
​ |  | 2,103,488
​ |  | 19,194,621
Summary of activity for options issued to employees, consultants, and directors | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | average
​ | ​ | ​ | ​ | average | ​ | remaining
​ | ​ | Number of | ​ | exercise | ​ | contractual
​ | ​ | shares | ​ | price | ​ | life
Options outstanding at January 1, 2021 |  | 735,803 | ​ | $ | 1.22 |  | 8.2
Granted |  | 700,170 | ​ |  | 1.62 |  | —
Exercised |  | (71,647) | ​ |  | 0.81 |  | —
Forfeiture |  | (57,246) | ​ |  | 2.43 |  | —
Options outstanding at December 31, 2021 |  | 1,307,080 | ​ |  | 1.22 |  | 8.4
Granted |  | 550,049 | ​ |  | 2.43 |  | —
Exercised |  | (82,879) | ​ |  | 0.81 |  | —
Forfeiture |  | (103,174) | ​ |  | 1.22 |  | —
Options outstanding at December 31, 2022 |  | 1,671,076 | ​ |  | 1.62 |  | 8.2
Summary of information about all options outstanding and exercisable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Options outstanding |  | Options Exercisable
​ | ​ | ​ |  | Weighted |  | ​
​ | ​ | Number | ​ | average | ​ | Number
​ | ​ | outstanding at | ​ | remaining | ​ | exercisable at
​ | ​ | December 31, | ​ | contractual | ​ | December 31,
Exercise Price | ​ | 2022 | ​ | life | ​ | 2022
$0.41 |  | 540,863 |  | 8.00 | ​ | 380,641
$1.22 |  | 211,405 |  | 5.20 | ​ | 211,134
$1.62 |  | 4,100 |  | 1.10 | ​ | 4,100
$2.03 |  | 7,415 |  | 4.60 | ​ | 7,415
$2.43 |  | 900,291 |  | 9.20 | ​ | 203,651
$2.84 |  | 1,413 |  | 2.80 | ​ | 1,413
$3.65 – $18.61 |  | 5,589 |  | 3.32 | ​ | 5,589
​ |  | 1,671,076 | ​ | ​ | ​ | 813,943
Schedule of valuation assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |
Valuation assumptions: |  |  |  |  | ​
Expected dividend yield |  | — | % | — | %
Expected volatility |  | 32 | % | 32 | %
Expected term (years)(1) |  | 5.6 – 6.2 |  | 5.0 – 6.1 | ​
Risk-free interest rate |  | 2.76 | % | 1.14 | %
(1) | Our historical exercise behavior for previous grants does not provide a reasonable estimate for future exercise activity for employees who have been awarded stock options in the past three years. Therefore, the average expected term was calculated using the simplified method, as defined by GAAP, for estimating the expected term.

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