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Equity (Tables) | 6 Months Ended
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Jun. 30, 2022
Equity Incentive Plan [Member] |
Schedule of share-based compensation activity | Ending balances of the Plans are as follows: ​
​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
(in thousands) |  | 2022 |  | 2021
Outstanding options and restricted stock units |  | 3,358 |  | 3,076
Reserved but unissued shares under the Plans | ​ | 2,706 | ​ | 2,901
Total authorized shares under the Plans |  | 6,064 |  | 5,977
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: ​
​ | ​ | ​ | ​
​ | ​ | June 30, | ​
​ | ​ | 2022 | ​
Expected life |  | 5.71 years |
Weighted average volatility | ​ | 77.64 | %
Weighted average risk-free interest rate | ​ | 1.39 | %
Expected dividend rate | ​ | 0 | %
Schedule of stock option activity | A summary of the Company’s stock option activity and changes is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30,
​ | ​ | 2022
(in thousands) | ​ | Options to Purchase Common Stock | ​ | Weighted Average Exercise Price | ​ | Weighted Average Remaining Contractual Life (in years)
Outstanding at January 1 |  | 2,964 | ​ | $ | 2.06 |  | 6.89
Granted |  | 88 | ​ | $ | 1.26 |  | 9.51
Exercised |  | (3) | ​ | $ | 0.89 |  | —
Forfeited/Expired |  | (10) | ​ | $ | 2.93 |  | —
Outstanding at June 30 |  | 3,039 | ​ | $ | 2.03 |  | 6.47
Exercisable at June 30 |  | 2,212 | ​ | $ | 1.71 |  | 5.79
Consultant Stock Plan |
Schedule of share-based compensation activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Six Months Ended
​ | ​ | June 30,
​ |  | 2022 |  | 2021
Compensation Expense | ​ | $ | 14 | ​ | $ | 17
Weighted Average Value Per Share | ​ | $ | 1.93 | ​ | $ | 2.33
Schedule of stock option activity | ​
​ | ​ | ​ | ​
​ | ​ | June 30,
(in thousands) |  | 2022
Reserved but unissued shares, January 1 | ​ | ​ | 211
Grants | ​ | ​ | (8)
Reserved but unissued shares | ​ |  | 203

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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