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Equity (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2024
Schedule of outstanding, reserved and authorized shares under share-based compensation plans | ​
​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
(in thousands) |  | 2024 |  | 2023
Outstanding options and restricted stock units |  | 3,339 |  | 3,430
Reserved but unissued shares under the Plan | ​ | 1,862 | ​ | 2,302
Total authorized shares under the Plan |  | 5,201 |  | 5,732
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30,
​ | ​ | 2024
(in thousands, except per share data) | ​ | Options to Purchase Common Stock | ​ | Weighted Average Exercise Price | ​ | Weighted Average Remaining Contractual Life (in years)
Outstanding at beginning of year |  | 2,759 | ​ | $ | 2.07 |  | 5.38
Granted |  | — | ​ | $ | — |  | —
Exercised |  | — | ​ | $ | — |  | —
Forfeited/Expired |  | (102) | ​ | $ | 0.88 |  | —
Outstanding at end of period |  | 2,657 | ​ | $ | 2.11 |  | 5.08
Exercisable at end of period |  | 1,947 | ​ | $ | 1.75 |  | 4.65
Schedule of restricted stock unit activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30,
​ | ​ | 2024
(in thousands, except per share data) | ​ | Number of Shares | ​ | Weighted Average Grant Date Fair Value
Nonvested at beginning of period |  | 671 | ​ | $ | 1.05
Granted |  | 334 | ​ | $ | 1.04
Vested |  | (323) | ​ | $ | 1.08
Forfeited | ​ | — | ​ | $ | —
Nonvested at end of period |  | 682 | ​ | $ | 1.03
Schedule of share-based compensation activity | ​
​ | ​ | ​ | ​
​ | ​ | June 30,
(in thousands) |  | 2024
Reserved but unissued shares at beginning of period | ​ | ​ | 188
Increases in the number of authorized shares | ​ | ​ | 115
Grants | ​ | ​ | (8)
Reserved but unissued shares at end of period | ​ |  | 295
Schedule of initial carrying value | ​
​ | ​ | ​
(in thousands) | ​ | Allocated Amount
Common Stock | $ | 2,391
Public Warrants | ​ | 1,831
​ | $ | 4,222
​
​ | ​ | ​
(in thousands) | ​ | Allocated Amount
Common Stock | $ | 865
Private Pre-Funded Warrants | ​ | 1,214
Private Warrants | ​ | 2,389
​ | $ | 4,468
​
​ | ​ | ​
(in thousands) | ​ | Allocated Amount
Common Stock | $ | 1,447
Participation Right Pre-Funded Warrants | ​ | 580
Participation Right Private Warrants | ​ | 2,250
​ | $ | 4,277
Schedule of public warrants and underwriter warrants | ​
​ | ​ | ​
Stock Price | $ | 0.79
Expected Volatility | ​ | 108.01%
Contractual/expected term (in years) | ​ | 5.00
Risk-free interest rate | ​ | 4.64%
Expected dividend yield | ​ | 0%
​
​ | ​ | ​
Stock Price | $ | 0.79
Expected Volatility | ​ | 108.01%
Contractual/expected term (in years) | ​ | 5.00
Risk-free interest rate | ​ | 4.64%
Expected dividend yield | ​ | 0%
​
​ | ​ | ​
Stock Price | $ | 0.65
Expected Volatility | ​ | 108.01%
Contractual/expected term (in years) | ​ | 5.00
Risk-free interest rate | ​ | 4.25%
Expected dividend yield | ​ | 0%
Summary of warrants outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Warrants | ​ | Pre-Funded Warrants1
(in thousands, except per share data) | ​ | Number | ​ | Wtd. Avg. Exercise Price | ​ | Wtd. Avg. Remaining Life (in years) | ​ | Number | ​ | Wtd. Avg. Exercise Price
Beginning Balance | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Granted | ​ | 21,319 | $ | 1.0535 | ​ | 5.24 | ​ | 4,499 | $ | 0.0001
Exercised | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Forfeited/Expired | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Outstanding at Period End | ​ | 21,319 | $ | 1.0535 | ​ | 5.24 | ​ | 4,499 | $ | 0.0001
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) Pre-Funded warrants have no expiration date and only expire when exercised in full.
Restricted Stock Units (RSUs) [Member] |
Schedule of compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | For the Three Months Ended | ​ | For the Six Months Ended
​ | June 30, | ​ | June 30,
(in thousands, except per share data) | 2024 | 2023 | ​ | 2024 |  | 2023
Compensation Expense | $ | 306 | $ | 13 | ​ | $ | 342 | $ | 212 | ​
Weighted Average Value Per Share | $ | 1.36 | $ | 0.79 | ​ | $ | 1.32 | $ | 1.23 | ​
Equity Incentive Plan |
Schedule of compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Six Months Ended
​ | ​ | June 30,
(in thousands, except per share data) |  | 2024 |  | 2023
Fair value | ​ | $ | 326 | ​ | $ | 234
Weighted Average Value Per Share | ​ | $ | 1.06 | ​ | $ | 0.79
Consultant Stock Plan |
Schedule of compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | For the Three Months Ended | ​ | For the Six Months Ended
​ | June 30, | ​ | June 30,
(in thousands, except per share data) | 2024 |  | 2023 |  | 2024 |  | 2023
Compensation Expense | $ | 3 | ​ | $ | 2 | ​ | $ | 6 | ​ | $ | 5
Weighted Average Value Per Share | $ | 0.81 | ​ | $ | 0.66 | ​ | $ | 0.81 | ​ | $ | 0.66
​

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