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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Stock Incentive Plans |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Value
​ |  | Shares |  | Price |  | Term (years) |  | (in thousands)
Outstanding at December 31, 2022 | ​ | 2,253,431 | ​ | $ | 15.43 | ​ | 8.57 | ​ | $ | 9,733
Granted |  | 1,906,050 | ​ | $ | 12.01 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (78,050) | ​ | $ | 5.37 | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (526,939) | ​ | $ | 16.80 | ​ | ​ | ​ | ​ | ​
Expired | ​ | (523) | ​ | $ | 138.60 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2023 |  | 3,553,969 | ​ | $ | 13.59 |  | 8.39 | ​ | $ | 1,912
Vested and exercisable at December 31, 2023 |  | 1,107,936 | ​ | $ | 18.62 |  | 7.42 | ​ | $ | 821
Vested and expected to vest at December 31, 2023 | ​ | 3,553,969 | ​ | $ | 13.59 | ​ | 8.39 | ​ | $ | 1,912
​
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2023 |  | 2022
Weighted-average expected volatility |  | 65.86%-73.68% | ​ | 65.60-70.22%
Expected term (in years) |  | 5.5-6.25 | ​ | 5-6.25
Risk-free interest rate |  | 3.42%-4.67% | ​ | 1.48-4.17%
Expected dividend yield |  | 0% | ​ | 0%
​

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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