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Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity Incentive Plan [Member] |
Schedule of share-based compensation activity | ​ Ending balances of the Plans are as follows: ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) |  | 2021 |  | 2020
Outstanding options and restricted stock units |  | 3,076 |  | 2,697
Reserved but unissued shares under the Plans | ​ | 2,901 | ​ | 1,217
Total authorized shares under the Plans |  | 5,977 |  | 3,914
Warrant [Member] |
Schedule Of warrant activity | A summary of warrant activity and related information is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
​ |  | ​ |  | Weighted |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise
(in thousands) | ​ | Warrants | ​ | Price | ​ | Warrants | ​ | Price
Outstanding at January 1 |  | 80 | ​ | $ | 1.80 |  | 80 | ​ | $ | 1.80
Granted |  | — | ​ |  | — |  | — | ​ | ​ | —
Exercised |  | (38) | ​ |  | 1.80 |  | — | ​ |  | —
Forfeited/Expired |  | (43) | ​ | ​ | 1.80 |  | — | ​ | ​ | —
Outstanding at December 31 |  | — | ​ | $ | — |  | 80 | ​ | $ | 1.80
Stock options |
Schedule of weighted-average assumptions used in calculation of fair value of stock options | ​ The following weighted-average assumptions were utilized in the calculation of the fair value of stock options: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2021 | ​ | 2020 | ​
Expected life |  | 6.01 years |  | 6.98 years | ​
Weighted average volatility | ​ | 91.89 | % | 76.50 | %
Weighted average risk-free interest rate | ​ | 0.59 | % | 1.26 | %
Expected dividend rate | ​ | 0 | % | 0 | %
Schedule of stock option activity | A summary of the Company’s stock option activity and changes is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | ​ | ​ | ​ | Average
​ | ​ | Options to | ​ | Weighted | ​ | Remaining | ​ | Options to | ​ | Weighted | ​ | Remaining
​ | ​ | Purchase | ​ | Average | ​ | Contractual | ​ | Purchase | ​ | Average | ​ | Contractual
​ | ​ | Common | ​ | Exercise | ​ | Life (in | ​ | Common | ​ | Exercise | ​ | Life (in
(in thousands) |  | Stock |  | Price |  | years) |  | Stock |  | Price |  | years)
Outstanding at January 1 |  | 2,697 | ​ | $ | 2.18 |  | 7.53 |  | 2,131 | ​ | $ | 2.53 |  | 7.99
Granted |  | 1,065 | ​ | $ | 3.15 |  | 8.40 |  | 743 | ​ | $ | 1.07 |  | 9.23
Exercised |  | (327) | ​ | $ | 1.41 |  | — |  | (117) | ​ | $ | 1.08 |  | —
Forfeited/Expired/Exchanged |  | (471) | ​ | $ | 5.70 |  | — |  | (60) | ​ | $ | 2.88 |  | —
Outstanding at December 31 |  | 2,964 | ​ | $ | 2.06 |  | 6.89 |  | 2,697 | ​ | $ | 2.18 |  | 7.53
Exercisable at December 31 |  | 2,178 | ​ | $ | 1.72 |  | 6.20 |  | 2,380 | ​ | $ | 2.26 |  | 7.48
​
Consultant Stock Plan |
Schedule of share-based compensation activity | ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) |  | 2021 |  | 2020
Reserved but unissued shares January 1 | ​ | 212 | ​ | 190
Increases in the number of authorized shares | ​ | 14 | ​ | 33
Grants | ​ | (15) | ​ | (11)
Reserved but unissued shares December 31 | ​ | 211 | ​ | 212

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