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Stock-Based Compensation (Details 1) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 31, 2013
Stock-based compensation |  |  |  |  |
Stock-based compensation expense (credit) |  | $ (581) | $ 2,662 |  |
Stock Options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares outstanding (in shares) |  | 171,369 | 308,967 | 370,547 |
Weighted average exercise price of options outstanding (in dollars per share) |  | $ 60.66 | $ 60.80 | $ 77.23 |
Weighted average grant date fair value (in dollars per share) |  | $ 3.55 | $ 5.32 |  |
Unrecognized compensation cost |  | $ 200 |  |  |
Unrecognized compensation cost, recognition period |  | 2 years 10 months 6 days |  |  |
Cash Stock Appreciation Rights |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares outstanding (in shares) |  | 12,676 | 86,618 | 0 |
Weighted average exercise price of options outstanding (in dollars per share) |  | $ 9.70 | $ 9.70 | $ 0.00 |
Unrecognized compensation cost |  | $ 0 |  |  |
Restricted Stock Units |  |  |  |  |
Stock-based compensation |  |  |  |  |
Unrecognized compensation cost |  | $ 900 |  |  |
Unrecognized compensation cost, recognition period |  | 2 years 2 months 27 days |  |  |
Phantom Stock Units |  |  |  |  |
Stock-based compensation |  |  |  |  |
Unrecognized compensation cost, recognition period |  | 2 years 1 month 24 days |  |  |
Unrecognized compensation cost |  | $ 100 |  |  |
Performance Stock Units |  |  |  |  |
Stock-based compensation |  |  |  |  |
Unrecognized compensation cost |  | $ 200 |  |  |
Unrecognized compensation cost, recognition period |  | 1 year |  |  |
Performance period |  | 3 years |  |  |
Cash Performance Stock Units |  |  |  |  |
Stock-based compensation |  |  |  |  |
Unrecognized compensation cost |  | $ 0 |  |  |
Performance period |  | 3 years |  |  |
2013 Plan |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares authorized (in shares) |  |  |  |  | 500,000.0
Shares available for grant (in shares) |  | 200,000 | 100,000 |  |
2013 Plan | Stock Options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Expiration period |  | 10 years |  |  |
2013 Plan | Cash Stock Appreciation Rights | Tranche Two |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
2013 Plan | Cash Stock Appreciation Rights | Tranche Three |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
2013 Plan | Cash Stock Appreciation Rights | Tranche Four |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
2013 Plan | Phantom Stock Units |  |  |  |  |
Stock-based compensation |  |  |  |  |
Expiration period |  | 10 years |  |  |
Vesting period |  | 4 years |  |  |
2013 Plan | Phantom Stock Units | Tranche One |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
2013 Plan | Phantom Stock Units | Tranche Two |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
2013 Plan | Phantom Stock Units | Tranche Three |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
2013 Plan | Phantom Stock Units | Tranche Four |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
2013 Plan | Cash Performance Stock Units | Minimum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Percent of awards issued based on performance |  | 0.00% |  |  |
2013 Plan | Cash Performance Stock Units | Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Percent of awards issued based on performance |  | 100.00% |  |  |
2005 Plan |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares available for grant (in shares) |  | 0 |  |  |
2005 Plan | Stock Options | Range $7.40 to $123.10 |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares outstanding (in shares) |  | 95,000 |  |  |
2005 Plan | Stock Options | Range $7.40 to $123.10 | Minimum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Weighted average exercise price of options outstanding (in dollars per share) |  | $ 7.40 |  |  |
2005 Plan | Stock Options | Range $7.40 to $123.10 | Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Weighted average exercise price of options outstanding (in dollars per share) |  | $ 123.10 |  |  |
Inducement Awards | Stock Options | CEO |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock-based compensation expense (credit) | $ (100) |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
Inducement Awards | Stock Options | Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Weighted average exercise price of options outstanding (in dollars per share) |  | $ 119.00 |  |  |
Inducement Awards | Stock Options | Range $7.40 to $60.40 |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares outstanding (in shares) |  | 34,000 |  |  |
Inducement Awards | Stock Options | Range $7.40 to $60.40 | Minimum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Weighted average exercise price of options outstanding (in dollars per share) |  | $ 7.40 |  |  |
Inducement Awards | Stock Options | Range $7.40 to $60.40 | Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Weighted average exercise price of options outstanding (in dollars per share) |  | $ 60.40 |  |  |
Inducement Awards | Stock Options | Range $7.40 to $119.00 |  |  |  |  |
Stock-based compensation |  |  |  |  |
Shares outstanding (in shares) |  | 42,000 |  |  |
Inducement Awards | Stock Options | Range $7.40 to $119.00 | Minimum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Weighted average exercise price of options outstanding (in dollars per share) |  | $ 7.40 |  |  |
Inducement Awards | Stock Options | Tranche One |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
Inducement Awards | Stock Options | Tranche Two |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
Inducement Awards | Stock Options | Tranche Three |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
Inducement Awards | Stock Options | Tranche Four |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
2013 CEO Plan | Stock Options | Tranche Two |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
2013 CEO Plan | Stock Options | Tranche Three |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |
2013 CEO Plan | Stock Options | Tranche Four |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting rights (as percent) |  | 25.00% |  |  |

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