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Stock-Based Compensation and Stock Options (Details) - Stock Options $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 USD ($) shares | Jun. 30, 2018 $ / shares shares | May 31, 2018 $ / shares shares | Apr. 30, 2018 installment $ / shares shares | Oct. 31, 2017 $ / shares shares | Mar. 31, 2016 $ / shares shares | Sep. 30, 2015 $ / shares shares | Jan. 31, 2012 $ / shares shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2014 shares
January 2012 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  |  |  | 100,000 |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 28.98 |  |  |  |
Options vested and become exercisable annually (in shares) |  |  |  |  |  |  |  | 25,000 |  |  |  |
Options canceled (in shares) |  |  |  |  |  |  |  |  |  |  |  | 25,000
Options forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  | 25,000
Options outstanding (in shares) | 50,000 |  |  |  |  |  |  |  | 50,000 | 50,000 |  |
Options vested (in shares) | 50,000 |  |  |  |  |  |  |  |  |  |  |
September 2015 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  |  | 400,000 |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 8.07 |  |  |  |  |
Options outstanding (in shares) | 400,000 |  |  |  |  |  |  |  | 400,000 | 400,000 |  |
Options vested and become exercisable quarterly (in shares) |  |  |  |  |  |  | 50,000 |  |  |  |  |
Options vested (in shares) | 400,000 |  |  |  |  |  |  |  |  |  |  |
March 2016 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  |  | 150,000 |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  | $ 8.55 |  |  |  |  |  |
Options vested and become exercisable annually (in shares) |  |  |  |  |  | 37,500 |  |  |  |  |  |
Options outstanding (in shares) | 100,000 |  |  |  |  |  |  |  | 100,000 | 100,000 |  |
Options vested (in shares) | 50,000 |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 30 | $ 89 |  |
Unrecognized stock-based compensation expense | $ | $ 170 |  |  |  |  |  |  |  | $ 170 | $ 170 |  |
Expected duration for recognition of stock based compensation expense (in years) |  |  |  |  |  |  |  |  |  | 1 year 4 months 24 days |  |
October 2017 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  |  | 400,000 |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  | $ 6.95 |  |  |  |  |  |  |
Options outstanding (in shares) | 400,000 |  |  |  |  |  |  |  | 400,000 | 400,000 |  |
Options vested and become exercisable quarterly (in shares) |  |  |  |  | 50,000 |  |  |  |  |  |  |
Options vested (in shares) | 150,000 |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 143 | $ 430 |  |
Unrecognized stock-based compensation expense | $ | $ 717 |  |  |  |  |  |  |  | $ 717 | $ 717 |  |
Expected duration for recognition of stock based compensation expense (in years) |  |  |  |  |  |  |  |  |  | 15 months |  |
April 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  |  | 50,000 |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  | $ 10.50 |  |  |  |  |  |  |  |
Options outstanding (in shares) | 50,000 |  |  |  |  |  |  |  | 50,000 | 50,000 |  |
Options vested (in shares) | 12,500 |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 20 | $ 60 |  |
Unrecognized stock-based compensation expense | $ | $ 181 |  |  |  |  |  |  |  | $ 181 | $ 181 |  |
Expected duration for recognition of stock based compensation expense (in years) |  |  |  |  |  |  |  |  |  | 2 years 3 months |  |
Number of installments | installment |  |  |  | 12 |  |  |  |  |  |  |  |
May 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  |  | 50,000 |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  | $ 14.70 |  |  |  |  |  |  |  |  |
Options vested and become exercisable annually (in shares) |  |  | 12,500 |  |  |  |  |  |  |  |  |
Options outstanding (in shares) | 50,000 |  |  |  |  |  |  |  | 50,000 | 50,000 |  |
Options vested (in shares) |  |  |  |  |  |  |  |  |  | 0 |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 22 | $ 34 |  |
Unrecognized stock-based compensation expense | $ | $ 324 |  |  |  |  |  |  |  | $ 324 | $ 324 |  |
Expected duration for recognition of stock based compensation expense (in years) |  |  |  |  |  |  |  |  |  | 3 years 7 months 15 days |  |
Executive Officer | March 2016 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Options canceled (in shares) |  |  |  |  |  |  |  |  |  |  | 12,500 |
Options forfeited (in shares) |  |  |  |  |  |  |  |  |  |  | 37,500 |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  | $ 19 |
Nonemployee | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  | 100,000 |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  | $ 17.75 |  |  |  |  |  |  |  |  |  |
Options forfeited (in shares) |  |  |  |  |  |  |  |  |  | 80,000 |  |
Options outstanding (in shares) | 20,000 |  |  |  |  |  |  |  | 20,000 | 20,000 |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 122 | $ 122 |  |
Employee | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Employee options granted to purchase shares of common stock (in shares) |  | 50,000 |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  | $ 16.65 |  |  |  |  |  |  |  |  |  |
Options vested and become exercisable annually (in shares) |  | 12,500 |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) | 50,000 |  |  |  |  |  |  |  | 50,000 | 50,000 |  |
Options vested (in shares) |  |  |  |  |  |  |  |  |  | 0 |  |
Total stock-based compensation expense | $ |  |  |  |  |  |  |  |  | $ 25 | $ 28 |  |
Unrecognized stock-based compensation expense | $ | $ 377 |  |  |  |  |  |  |  | $ 377 | $ 377 |  |
Expected duration for recognition of stock based compensation expense (in years) |  |  |  |  |  |  |  |  |  | 3 years 8 months 23 days |  |
Tranche One | Nonemployee | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Options vested (in shares) |  | 20,000 |  |  |  |  |  |  |  |  |  |
Tranche Two | Nonemployee | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Options vested (in shares) |  | 30,000 |  |  |  |  |  |  |  |  |  |
Tranche Three | Nonemployee | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Options vested (in shares) |  | 50,000 |  |  |  |  |  |  |  |  |  |

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