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Shareholders' Equity (Details 3) - 2012 Equity Incentive Plan - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Stock options |  |  |  |
Stock Options |  |  |  |
Outstanding at beginning of the period (in shares) | 2,165,000 | 1,190,000 | 1,190,000 |
Granted (in shares) | 588,500 | 1,220,000 |  |
Exercised (in shares) | (15,000) | (28,750) |  |
Forfeited (in shares) | (178,500) | (216,250) |  |
Outstanding at end of the period (in shares) | 2,560,000 | 2,165,000 | 2,165,000 | 1,190,000
Exercisable at end of the period (in shares) | 636,250 | 131,250 |  |
Weighted Average Exercise Price |  |  |  |
Outstanding at beginning of the period (in USD per share) | $ 16.17 | $ 15.48 | $ 15.48 |
Granted (in USD per share) | 16.49 | 16.74 |  |
Exercised (in USD per share) | 15.00 | 15.00 |  |
Forfeited (in USD per share) | 16.57 | 15.70 |  |
Outstanding at end of the period (in USD per share) | 16.23 | 16.17 | $ 16.17 | $ 15.48
Exercisable at end of the period (in USD per share) | $ 15.94 | $ 15.00 |  |
Aggregate intrinsic value |  |  |  |
Weighted average remaining life (years) | 8 years 3 months 18 days | 9 years 3 months 18 days | 8 years 9 months 18 days | 9 years 3 months 18 days
Weighted average exercisable (years) | 7 years 8 months 12 days | 8 years 4 months 24 days |  |
Aggregate intrinsic value | $ 557 | $ 3,438 | $ 1,890 | $ 862
Aggregate intrinsic value exercised | 19 | 74 |  |
Aggregate intrinsic value exercisable | $ 273 | $ 362 |  |
Restricted stock units |  |  |  |
Class of Stock |  |  |  |
Restricted stock unit grants in period (in shares) | 44,000 | 92,000 |  |
Stock options and Restricted stock units |  |  |  |
Class of Stock |  |  |  |
Vesting period for stock options and restricted stock units | 4 years | 4 years |  |
Expiration period for stock options and restricted stock units | 10 years | 10 years |  |

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