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Stock-Based Compensation and Stock Options - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |
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Dec. 31, 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 | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2014 shares | Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  |  |  | 250,000 | 400,000 | 150,000 |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 15.47 | $ 6.95 | $ 8.55 |  |
Options forfeited (in shares) |  |  |  |  |  |  |  |  | 150,000 | 50,000 | 325,000 |  |
Options outstanding (in shares) | 1,050,000 |  |  |  |  |  |  |  | 1,050,000 | 950,000 | 600,000 |  | 775,000
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated share-based compensation expense (reversal of) | $ |  |  |  |  |  |  |  |  | $ 915,000 | $ 1,000,000 | $ 933,000 |  |
Stock Options | Employee Options 2012 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 28.98 |  |  |  |  |
Options vest and become exercisable annually (in shares) |  |  |  |  |  |  |  | 25,000 |  |  |  |  |
Options canceled (in shares) |  |  |  |  |  |  |  |  |  |  |  | 25,000 |
Options forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  | 25,000 |
Options vested (in shares) |  |  |  |  |  |  |  |  | 50,000 |  |  |  |
Options outstanding (in shares) | 50,000,000 |  |  |  |  |  |  |  | 50,000,000 |  |  |  |
Unrecognized stock-based compensation expense | $ | $ 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |
Stock Options | Employee Options 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  | 400,000 |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 8.07 |  |  |  |  |  |
Options vested (in shares) |  |  |  |  |  |  |  |  | 400,000 |  |  |  |
Options outstanding (in shares) | 400,000 |  |  |  |  |  |  |  | 400,000 |  |  |  |
Options vest and become exercisable quarterly (in shares) |  |  |  |  |  |  | 50,000 |  |  |  |  |  |
Stock Options | Employee Options 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  | 150,000 |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  |  | $ 8.55 |  |  |  |  |  |  |
Options vest and become exercisable annually (in shares) |  |  |  |  |  | 37,500 |  |  |  |  |  |  |
Options outstanding (in shares) | 50,000 |  |  |  |  |  |  |  | 50,000 |  |  |  |
Unrecognized stock-based compensation expense | $ | $ 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |
Stock Options | Employee Options 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  | 400,000 |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  |  | $ 6.95 |  |  |  |  |  |  |  |
Options outstanding (in shares) | 200,000 |  |  |  |  |  |  |  | 200,000 |  |  |  |
Options vest and become exercisable quarterly (in shares) |  |  |  |  | 50,000 |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense | $ | $ 573,000 |  |  |  |  |  |  |  | $ 573,000 |  |  |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Stock Options | 2018 Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense | $ | $ 815,000 |  |  |  |  |  |  |  | $ 815,000 |  |  |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  |  |  |  |  | 2 years 10 months 24 days |  |  |  |
Stock Options | April 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  | 50,000 |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  |  | $ 10.50 |  |  |  |  |  |  |  |  |
Options vested (in shares) | 16,667 |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) | 50,000 |  |  |  |  |  |  |  | 50,000 |  |  |  |
Vesting installments | installment |  |  |  | 12 |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense | $ | $ 161,000 |  |  |  |  |  |  |  | $ 161,000 |  |  |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  |  |  |  |  | 2 years |  |  |  |
Stock Options | May 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  | 50,000 |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  |  | $ 14.70 |  |  |  |  |  |  |  |  |  |
Options vest and become exercisable annually (in shares) |  |  | 12,500 |  |  |  |  |  |  |  |  |  |
Options vested (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) | 50,000 |  |  |  |  |  |  |  | 50,000 |  |  |  |
Unrecognized stock-based compensation expense | $ | $ 302,000 |  |  |  |  |  |  |  | $ 302,000 |  |  |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  |  |  |  |  | 3 years 4 months 24 days |  |  |  |
Executive Officer | Stock Options | Employee Options 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options canceled (in shares) |  |  |  |  |  |  |  |  |  | 12,500 |  |  |
Options forfeited (in shares) |  |  |  |  |  |  |  |  | 50,000 | 37,500 |  |  |
Allocated share-based compensation expense (reversal of) | $ |  |  |  |  |  |  |  |  | $ (59,000) | $ (19,000) |  |  |
Nonemployee | Stock Options | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  | $ 17.75 |  |  |  |  |  |  |  |  |  |  |
Options canceled (in shares) |  |  |  |  |  |  |  |  | 20,000 |  |  |  |
Options forfeited (in shares) |  |  |  |  |  |  |  |  | 80,000 |  |  |  |
Employee | Stock Options | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  | 50,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares |  | $ 16.65 |  |  |  |  |  |  |  |  |  |  |
Options vest and become exercisable annually (in shares) |  | 12,500 |  |  |  |  |  |  |  |  |  |  |
Options vested (in shares) | 0 |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) | 50,000 |  |  |  |  |  |  |  | 50,000 |  |  |  |
Unrecognized stock-based compensation expense | $ | $ 352,000 |  |  |  |  |  |  |  | $ 352,000 |  |  |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  |  |  |  |  | 3 years 6 months |  |  |  |
Share-based Compensation Award, Tranche One | Nonemployee | Stock Options | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested (in shares) |  | 20,000 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Award, Tranche Two | Nonemployee | Stock Options | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested (in shares) |  | 30,000 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Award, Tranche Three | Nonemployee | Stock Options | June 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested (in shares) |  | 50,000 |  |  |  |  |  |  |  |  |  |  |

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