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Stock-Based Compensation and Stock Options - Outstanding Options (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ 15.47 | $ 6.95 | $ 8.55 |
Shares Outstanding (in shares) | 1,050,000 | 950,000 | 600,000 | 775,000
Options Outstanding Weighted-Average Remaining Contractual Life | 7 years 6 months 11 days | 8 years 5 months 23 days | 8 years 6 months 20 days | 5 years 6 months 11 days
Options Exercisable Weighted-Average Remaining Contractual Life | 7 years 1 month 27 days |  |  |
Exercise Price 1 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ 28.98 |  |  |
Shares Outstanding (in shares) | 50,000 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life | 3 years 25 days |  |  |
Weighted- Average Exercise Price (in dollars per share) | $ 28.98 |  |  |
Shares Outstanding and Exercisable (in shares) | 50,000 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life | 3 years 25 days |  |  |
Exercise Price 2 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ 8.07 |  |  |
Shares Outstanding (in shares) | 400,000 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life | 6 years 9 months |  |  |
Weighted- Average Exercise Price (in dollars per share) | $ 8.07 |  |  |
Shares Outstanding and Exercisable (in shares) | 400,000 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life | 6 years 9 months |  |  |
Exercise Price 3 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ 8.55 |  |  |
Shares Outstanding (in shares) | 50,000 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life | 7 years 2 months 8 days |  |  |
Weighted- Average Exercise Price (in dollars per share) | $ 8.55 |  |  |
Shares Outstanding and Exercisable (in shares) | 50,000 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life | 7 years 2 months 8 days |  |  |
Exercise Price 4 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ 6.95 |  |  |
Shares Outstanding (in shares) | 400,000 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life | 8 years 10 months 2 days |  |  |
Weighted- Average Exercise Price (in dollars per share) | $ 6.95 |  |  |
Shares Outstanding and Exercisable (in shares) | 200,000 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life | 8 years 10 months 2 days |  |  |
Exercise Price 5 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ 10.50 |  |  |
Shares Outstanding (in shares) | 50,000 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life | 9 years 3 months 25 days |  |  |
Weighted- Average Exercise Price (in dollars per share) | $ 10.50 |  |  |
Shares Outstanding and Exercisable (in shares) | 16,667 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life | 9 years 3 months 25 days |  |  |
Exercise Price 6 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ 14.70 |  |  |
Shares Outstanding (in shares) | 50,000 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life | 9 years 4 months 12 days |  |  |
Weighted- Average Exercise Price (in dollars per share) | $ 14.70 |  |  |
Shares Outstanding and Exercisable (in shares) | 0 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life | 9 years 4 months 12 days |  |  |
Exercise Price 7 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ 16.65 |  |  |
Shares Outstanding (in shares) | 50,000 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life | 4 years 5 months 19 days |  |  |
Weighted- Average Exercise Price (in dollars per share) | $ 16.65 |  |  |
Shares Outstanding and Exercisable (in shares) | 0 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life | 4 years 5 months 19 days |  |  |

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