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Stock-Based Compensation and Stock Options - Outstanding Options (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Exercise price of employee option shares of common stock (in dollars per share) | $ 6.95 | $ 8.55 | $ 8.07 |
Shares Outstanding (in shares) | 950,000 | 600,000 | 775,000 | 425,000
Options Outstanding Weighted-Average Remaining Contractual Life | 8 years 5 months 23 days | 8 years 6 months 20 days | 5 years 6 months 11 days | 5 years 9 months 15 days
Options Exercisable Weighted-Average Remaining Contractual Life | 7 years 4 months 17 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 | 4 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 | 4 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 | 7 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 | 7 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) | 100,000 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life | 8 years 2 months 8 days |  |  |
Weighted- Average Exercise Price (in dollars per share) | $ 8.55 |  |  |
Shares Outstanding and Exercisable (in shares) | 25,000 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life | 8 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 | 9 years 10 months 2 days |  |  |
Weighted- Average Exercise Price (in dollars per share) | $ 6.95 |  |  |
Shares Outstanding and Exercisable (in shares) | 0 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life | 9 years 10 months 2 days |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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