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Stock-Based Compensation - Options Outstanding and exercisable (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock-based compensation |  |  |  |  |
Stock based compensation expense related to shares issued for services |  |  | $ 53 |  |
Common Stock |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock based compensation expense related to shares issued for services |  |  | $ 1 |  |
Shares issued for services |  |  | 30,002 |  |
2008 LTIP | Directors | Common Stock |  |  |  |  |
Stock-based compensation |  |  |  |  |
Stock based compensation expense related to shares issued for services | $ 53 |  |  |  |
Shares issued for services | 30,002 |  |  |  |
2008 LTIP | Stock Options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number Outstanding |  |  | 537,500 | 540,625 | 90,625
Weighted Average Remaining Contractual Life |  |  | 6 years 11 months 23 days |  |
Weighted Average Exercise Price |  |  | $ 2.19 | $ 2.18 | $ 4.95
Aggregate Intrinsic Value |  |  | $ 333,000 |  |
Number Outstanding (Exercisable) |  |  | 177,500 | 90,625 |
Weighted Average Exercise Price (Exercisable) |  |  | $ 3.26 | $ 4.95 |
Aggregate Intrinsic Value (Exercisable) |  |  | $ 67,000 |  |
Stock based compensation expense |  |  | $ 39 | $ 32 |
Period for recognizing unrecognized compensation cost |  |  | 3 years 1 month 24 days |  |
2008 LTIP | Stock Options | January 21, 2009 |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number Outstanding |  |  | 7,500 |  |
Weighted Average Remaining Contractual Life |  |  | 1 year 18 days |  |
Weighted Average Exercise Price |  |  | $ 4.00 |  |
Number Outstanding (Exercisable) |  |  | 7,500 |  |
Weighted Average Exercise Price (Exercisable) |  |  | $ 4.00 |  |
2008 LTIP | Stock Options | March 18, 2009 |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number Outstanding |  |  | 75,000 |  |
Weighted Average Remaining Contractual Life |  |  | 1 year 2 months 16 days |  |
Weighted Average Exercise Price |  |  | $ 4.98 |  |
Number Outstanding (Exercisable) |  |  | 75,000 |  |
Weighted Average Exercise Price (Exercisable) |  |  | $ 4.98 |  |
2008 LTIP | Stock Options | January 21, 2010 |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number Outstanding |  |  | 5,000 |  |
Weighted Average Remaining Contractual Life |  |  | 2 years 18 days |  |
Weighted Average Exercise Price |  |  | $ 6.00 |  |
Number Outstanding (Exercisable) |  |  | 5,000 |  |
Weighted Average Exercise Price (Exercisable) |  |  | $ 6.00 |  |
2008 LTIP | Stock Options | February 24, 2016 |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number Outstanding |  |  | 450,000 |  |
Weighted Average Remaining Contractual Life |  |  | 8 years 1 month 24 days |  |
Weighted Average Exercise Price |  |  | $ 1.62 |  |
Number Outstanding (Exercisable) |  |  | 90,000 |  |
Weighted Average Exercise Price (Exercisable) |  |  | $ 1.62 |  |
2008 LTIP | Restricted stock | Chief Executive Officer |  |  |  |  |
Stock-based compensation |  |  |  |  |
Restricted stock award (in shares) |  | 120,483 |  |  |
Stock based compensation expense |  |  | $ 105 | $ 79 |
Unrecognized compensation cost |  |  | 39 |  |
2008 LTIP | Restricted stock | Chief Executive Officer | Two-year period |  |  |  |  |
Stock-based compensation |  |  |  |  |
Restricted stock award (in shares) |  | 100,000 |  |  |
Vesting period of stock award |  | 2 years |  |  |
2008 LTIP | Restricted stock | Chief Executive Officer | Three-year period |  |  |  |  |
Stock-based compensation |  |  |  |  |
Restricted stock award (in shares) |  | 20,483 |  |  |
Vesting period of stock award |  | 3 years |  |  |
2008 LTIP | Restricted stock | Chief Executive Officer | Expected Recognition Period: 3 months |  |  |  |  |
Stock-based compensation |  |  |  |  |
Unrecognized compensation cost |  |  | $ 23 |  |
Period for recognizing unrecognized compensation cost |  |  | 3 months |  |
2008 LTIP | Restricted stock | Chief Executive Officer | Expected Recognition Period: 15 months |  |  |  |  |
Stock-based compensation |  |  |  |  |
Unrecognized compensation cost |  |  | $ 16 |  |
Period for recognizing unrecognized compensation cost |  |  | 15 months |  |
2008 LTIP | Cash-settled restricted stock units | Chief Executive Officer |  |  |  |  |
Stock-based compensation |  |  |  |  |
Restricted stock award (in shares) | 129,270 |  |  |  |
Vesting period of stock award | 2 years |  |  |  |
Stock based compensation expense |  |  | $ 102 |  |

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