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Stock-Based Compensation and Stock Options - Narrative (Details)		1 Months Ended							12 Months Ended
	Dec. 31, 2018 USD ($) 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	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2014 shares	Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)									250,000	400,000	150,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares									$ 15.47	$ 6.95	$ 8.55
Options forfeited (in shares)									150,000	50,000	325,000
Options outstanding (in shares)	1,050,000								1,050,000	950,000	600,000		775,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense (reversal of) | $									$ 915,000	$ 1,000,000	$ 933,000
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) | $ / shares								$ 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								50,000,000
Unrecognized stock-based compensation expense | $	$ 0								$ 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) | $ / shares							$ 8.07
Options vested (in shares)									400,000
Options outstanding (in shares)	400,000								400,000
Options vest and become exercisable quarterly (in shares)							50,000
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) | $ / shares						$ 8.55
Options vest and become exercisable annually (in shares)						37,500
Options outstanding (in shares)	50,000								50,000
Unrecognized stock-based compensation expense | $	$ 0								$ 0
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) | $ / shares					$ 6.95
Options outstanding (in shares)	200,000								200,000
Options vest and become exercisable quarterly (in shares)					50,000
Unrecognized stock-based compensation expense | $	$ 573,000								$ 573,000
Unrecognized compensation expense, period for recognition (in years)									1 year
Stock Options | 2018 Plans
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized stock-based compensation expense | $	$ 815,000								$ 815,000
Unrecognized compensation expense, period for recognition (in years)									2 years 10 months 24 days
Stock Options | April 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)				50,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares				$ 10.50
Options vested (in shares)	16,667
Options outstanding (in shares)	50,000								50,000
Vesting installments | installment				12
Unrecognized stock-based compensation expense | $	$ 161,000								$ 161,000
Unrecognized compensation expense, period for recognition (in years)									2 years
Stock Options | May 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)			50,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares			$ 14.70
Options vest and become exercisable annually (in shares)			12,500
Options vested (in shares)	0
Options outstanding (in shares)	50,000								50,000
Unrecognized stock-based compensation expense | $	$ 302,000								$ 302,000
Unrecognized compensation expense, period for recognition (in years)									3 years 4 months 24 days
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)									50,000	37,500
Allocated share-based compensation expense (reversal of) | $									$ (59,000)	$ (19,000)
Nonemployee | Stock Options | June 2018 Plan
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) | $ / shares		$ 17.75
Options canceled (in shares)									20,000
Options forfeited (in shares)									80,000
Employee | Stock Options | June 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options granted (in shares)		50,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares		$ 16.65
Options vest and become exercisable annually (in shares)		12,500
Options vested (in shares)	0
Options outstanding (in shares)	50,000								50,000
Unrecognized stock-based compensation expense | $	$ 352,000								$ 352,000
Unrecognized compensation expense, period for recognition (in years)									3 years 6 months
Share-based Compensation Award, Tranche One | Nonemployee | Stock Options | June 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options vested (in shares)		20,000
Share-based Compensation Award, Tranche Two | Nonemployee | Stock Options | June 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options vested (in shares)		30,000
Share-based Compensation Award, Tranche Three | Nonemployee | Stock Options | June 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Options vested (in shares)		50,000

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