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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2024
Equity [Abstract] |
Schedule of purchases of equity Shares | The following table contains activity relating to our acquisition of equity securities during the six months ended June 30, 2024:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | ​ | ​ | Maximum number
​ | ​ | ​ | ​ | ​ | ​ | of shares
​ | ​ | Total number | ​ | Average price | ​ | remaining to be
​ | ​ | of shares | ​ | paid per | ​ | purchased under
​ |  | purchased | ​ | share |  | the program
Beginning of normal-course issuer bid, March 27, 2023 (1) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 1,324,495
January 2024 | ​ | 248,700 | ​ | $ | 4.82 | ​ | ​ | ​
Total as of March 26, 2024 | ​ | 248,700 | ​ | $ | 4.82 | ​ | ​ | 1,075,795
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning of normal-course issuer bid, March 27, 2024 (2) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 2,191,320
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
| (1) | Epsilon repurchased these shares under its 2023-2024 share repurchase program that commenced on March 27, 2023 and terminated on March 26, 2024, as described above.
| (2) | Epsilon has not repurchased any shares under its 2024-2025 share repurchase program that commenced on March 27, 2024 and terminates on March 26, 2025.
Schedule of restricted stock activity | The following table summarizes restricted stock unit activity for the six months ended June 30, 2024, and the year ended December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended | ​ | Year ended
​ | ​ | June 30, 2024 | ​ | December 31, 2023
​ | ​ | Number of | ​ | Weighted | ​ | Number of | ​ | Weighted
​ | ​ | Restricted | ​ | Average | ​ | Restricted | ​ | Average
​ | ​ | Shares | ​ | Remaining Life | ​ | Shares | ​ | Remaining Life
​ |  | Outstanding |  | (years) |  | Outstanding |  | (years)
Balance non-vested Restricted Stock at beginning of period | ​ | 491,536 | ​ | 1.74 | ​ | 298,210 | ​ | 1.74
Granted | ​ | 63,980 | ​ | 1.50 | ​ | 358,546 | ​ | 1.90
Vested | ​ | (18,702) | ​ | — | ​ | (165,220) | ​ | —
Balance non-vested Restricted Stock at end of period | ​ | 536,814 | ​ | 1.29 | ​ | 491,536 | ​ | 1.74
Schedule of PSU activity | The following table summarizes PSUs for the six months ended June 30, 2024 and the year ended December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended | ​ | Year ended
​ | ​ | June 30, 2024 | ​ | December 31, 2023
​ | ​ | Number of | ​ | Weighted | ​ | Number of | ​ | Weighted
​ | ​ | Performance | ​ | Average | ​ | Performance | ​ | Average
​ | ​ | Shares | ​ | Remaining Life | ​ | Shares | ​ | Remaining Life
​ |  | Outstanding |  | (years) |  | Outstanding |  | (years)
Balance non-vested PSUs at beginning of period | ​ | — | ​ | — | ​ | 15,833 | ​ | 1.00
Vested | ​ | — | ​ | — | ​ | (15,833) | ​ | —
Balance non-vested PSUs at end of period | ​ | — | ​ | — | ​ | — | ​ | —
​
Summary of stock option activity | The following table summarizes stock option activity for the six months ended June 30, 2024 and the year ended December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended | ​ | Year ended
​ | ​ | June 30, 2024 | ​ | December 31, 2023
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average | ​ | Number of | ​ | Average
​ | ​ | Options | ​ | Exercise | ​ | Options | ​ | Exercise
Exercise price in US$ |  | Outstanding |  | Price |  | Outstanding |  | Price (1)
Balance at beginning of period | ​ | 57,500 | ​ | $ | 5.03 | ​ | ​ | 70,000 | ​ | $ | 5.03
Exercised | ​ | — | ​ | $ | — | ​ | ​ | (12,500) | ​ | $ | 5.03
Expired | ​ | (57,500) | ​ | $ | — | ​ | ​ | — | ​ | $ | —
Balance at period-end | ​ | — | ​ | $ | — | ​ | ​ | 57,500 | ​ | $ | 5.03
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at period-end | ​ | — | ​ | $ | — | ​ | ​ | 57,500 | ​ | $ | 5.03

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