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Stock-based Compensation - 2015 Option Amendments (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 21, 2015 | Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Jul. 23, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Outstanding stock options (in shares) |  |  | 1,379,727 | 1,819,444 |  | 615,322
Exercise price (in dollars per share) |  |  | $ 8.71 | $ 7.52 |  | $ 9.55
Number of shares exercisable (in shares) |  |  | 635,548 | 1,022,515 |  |
Weighted average exercise price (in dollars per share) |  |  | $ 9.41 | $ 8.59 |  |
2014 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average incremental fair value (in dollars per share) |  |  | $ 3.77 |  |  |
Expected incremental compensation cost |  |  | $ 1,869 |  |  |
2014 Equity Incentive Plan | Chief Financial Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Post employment options exercise period |  | 90 days |  |  |  |
Post employment extended options exercise period |  | 36 months |  |  |  |
Outstanding stock options (in shares) |  | 74,490 |  |  |  |
Exercise price (in dollars per share) |  | $ 9.53 |  |  |  |
Number of unvested shares (in shares) |  | 50,814 |  |  |  |
Weighted average exercise price (in dollars per share) |  | $ 9.49 |  |  |  |
Compensatory Arrangement with Executive Officer | President |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Post employment options exercise period | 90 days |  |  |  |  |
Post employment extended options exercise period | 48 months |  |  |  |  |
Number of unvested shares (in shares) |  |  |  |  | 183,268 |
Number of shares exercisable (in shares) |  |  |  |  | 84,613 |
Weighted average exercise price (in dollars per share) |  |  |  |  | $ 9.61 |
Nonvested options weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 9.41 |

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