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Stock-Based Compensation and Stock Options (Details) $ / shares in Units, $ in Thousands		1 Months Ended									3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	May 31, 2019 installment $ / shares 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	Sep. 30, 2019 USD ($) shares	Jun. 30, 2019 shares	Mar. 31, 2019 shares	Sep. 30, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award
Options exercised (in shares)												250,000
January 2012 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)										100,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares										$ 28.98
Options vested and become exercisable annually (in shares)										25,000
Options canceled (in shares)													50,000				25,000
Options forfeited (in shares)																	25,000
September 2015 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)									400,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares									$ 8.07
Options vested and become exercisable quarterly (in shares)									50,000
Options vested (in shares)	400,000
Options outstanding (in shares)	400,000	400,000									400,000			400,000
March 2016 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)								150,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares								$ 8.55
Options vested and become exercisable annually (in shares)								37,500
Options canceled (in shares)																12,500
Options forfeited (in shares)															50,000	37,500
Total stock-based compensation expense | $															$ (59)	$ (19)
Options exercised (in shares)													50,000
Shares issued upon exercise of options (in shares)	4,000	4,000									4,000			4,000
October 2017 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)							400,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares							$ 6.95
Options vested and become exercisable quarterly (in shares)							50,000
Options vested (in shares)	100,000
Total stock-based compensation expense | $											$ 143			$ 430
Options exercised (in shares)														250,000
Options outstanding (in shares)	150,000	150,000									150,000			150,000
Unrecognized stock-based compensation expense | $	$ 143	$ 143									$ 143			$ 143
Expected duration for recognition of stock based compensation expense (in years)														3 months
April 2018 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)						50,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares						$ 10.50
Options canceled (in shares)											50,000
Total stock-based compensation expense | $											$ 34
Number of installments | installment						12
May 2018 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)					50,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares					$ 14.70
Options vested and become exercisable annually (in shares)					12,500
Options vested (in shares)	12,500
Total stock-based compensation expense | $											$ 22			$ 67
Options outstanding (in shares)	50,000	50,000									50,000			50,000
Unrecognized stock-based compensation expense | $	$ 235	$ 235									$ 235			$ 235
Expected duration for recognition of stock based compensation expense (in years)														2 years 7 months 15 days
June 2018 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)				50,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares				$ 16.65
Options vested and become exercisable annually (in shares)				12,500
Options vested (in shares)	12,500
Total stock-based compensation expense | $											$ 21			$ 53
Options outstanding (in shares)	50,000	50,000									50,000			50,000
Unrecognized stock-based compensation expense | $	$ 226	$ 226									$ 226			$ 226
Expected duration for recognition of stock based compensation expense (in years)														2 years 8 months 23 days
May 2019 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)	100,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares			$ 19.28
Options vested (in shares)	25,000		10,000
Total stock-based compensation expense | $											93			$ 239
Unrecognized stock-based compensation expense | $	$ 639	639									639			$ 639
Expected duration for recognition of stock based compensation expense (in years)														3 years 7 months 21 days
Number of installments | installment			3
September 2019 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)	450,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares	$ 10.79
Options vested (in shares)	112,500
Total stock-based compensation expense | $											46			$ 46
Unrecognized stock-based compensation expense | $	$ 2,200	$ 2,200									2,200			$ 2,200
Expected duration for recognition of stock based compensation expense (in years)														3 years 10 months 24 days
September 2019 Executive Options | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)		400,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares		$ 10.79
Options vested and become exercisable quarterly (in shares)		50,000
Total stock-based compensation expense | $											$ 68			$ 68
Options outstanding (in shares)	400,000	400,000									400,000			400,000
Unrecognized stock-based compensation expense | $	$ 1,800	$ 1,800									$ 1,800			$ 1,800
Expected duration for recognition of stock based compensation expense (in years)														2 years 3 months 2 days
September 2019 | May 2019 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Options vested and exercisable in future periods (in shares)			15,000
May 20, 2021 | May 2019 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Options vested and exercisable in future periods (in shares)			75,000

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