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Stock-Based Compensation and Stock Options - Outstanding Options (Details) - $ / shares	12 Months Ended
	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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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.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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