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Stock-Based Compensation and Stock Options - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2015 | Jan. 31, 2012 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  | 400,000 | 150,000 | 400,000 |
Exercise price of employee option shares of common stock (in dollars per share) |  |  |  |  | $ 6.95 | $ 8.55 | $ 8.07 |
Options forfeited (in shares) |  |  |  |  | 50,000 | 325,000 | 50,000 |
Options outstanding (in shares) |  |  |  |  | 950,000 | 600,000 | 775,000 | 425,000
Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |
Allocated share-based compensation expense (reversal of) |  |  |  |  | $ 1,000,000 | $ 933,000 | $ 401,000 |
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) |  |  |  | $ 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 |  |  |
Unrecognized stock-based compensation expense |  |  |  |  | $ 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) |  |  | $ 8.07 |  |  |  |  |
Options vested (in shares) |  |  |  |  | 400,000 |  |  |
Options vest and become exercisable quarterly (in shares) |  |  | 50,000 |  |  |  |  |
Options outstanding (in shares) |  |  |  |  | 400,000 |  |  |
Unrecognized stock-based compensation expense |  |  |  |  | $ 0 |  |  |
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) |  | $ 8.55 |  |  |  |  |  |
Options vest and become exercisable annually (in shares) |  | 37,500 |  |  |  |  |  |
Options outstanding (in shares) |  |  |  |  | 100,000 |  |  |
Unrecognized stock-based compensation expense |  |  |  |  | $ 258,000 |  |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  | 2 years 2 months 6 days |  |  |
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) | $ 6.95 |  |  |  |  |  |  |
Options vested (in shares) |  |  |  |  | 0 |  |  |
Options vest and become exercisable quarterly (in shares) | 50,000 |  |  |  |  |  |  |
Options outstanding (in shares) |  |  |  |  | 400,000 |  |  |
Unrecognized stock-based compensation expense |  |  |  |  | $ 1,100,000 |  |  |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  | 2 years |  |  |
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) |  |  |  |  | 37,500 |  |  |
Options vested (in shares) |  |  |  |  | 25,000 |  |  |
Allocated share-based compensation expense (reversal of) |  |  |  |  | $ (19,000) |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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