Stock Incentive Plans - 2016 Equity Compensation Plan Stock Options Activity (Details) - Employee Stock Option - 2016 Equity Compensation Plan - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Options
Balance outstanding beginning of period, options (in shares)	651,835	1,180,086
Options vested but not exercised (in shares)	(465,335)	(525,501)
Forfeited, options (in shares)	(4,500)	(1,875)
Exercised, options (in shares)		(875)
Balance outstanding end of period, options (in shares)	182,000	651,835	1,180,086
Weighted Average Exercise Price
Beginning balance, Weighted-average exercise price (in dollars per share)	$ 4.72	$ 4.65
Vested and unexercised (in dollars per share)	5.56	4.55
Forfeitures exercise price (in dollars per share)	5.56	5.56
Exercised (in dollars per share)		5.56
Ending balance, Weighted-average exercise price (in dollars per share)	5.56	4.72	$ 4.65
Fair Value of Options on grant date
Beginning balance, Fair Value of Options on Grant Date (in dollars per share)		2.91
Vested and unexercised, fair value (in dollars per share)	2.73	3.01
Forfeitures, fair value of options on grant date (in dollars per share)	2.60	2.60
Exercised, fair value of options on grant date (in dollars per share)		$ 2.60
Ending balance, Fair Value of Options on Grant Date (in dollars per share)	$ 2.60		$ 2.91
Aggregate fair value (in millions)
Balance outstanding beginning of period, aggregate fair value	$ 1,750	$ 3,430
Vested and unexercised, aggregate fair value	(1,270)	(1,600)
Forfeited, aggregate fair value	(10)	(50)
Exercised, fair value		(30)
Balance outstanding end of period, aggregate fair value	$ 470	$ 1,750	$ 3,430
Cumulative options vested or expected to vest (in shares)	1,818,921
Options vested or expected to vest (in shares)	182,000
Minimum
Aggregate fair value (in millions)
Exercise Price (in dollars per share)	$ 4.28
Maximum
Aggregate fair value (in millions)
Exercise Price (in dollars per share)	$ 5.56
Chief Financial Officer
Weighted Average Exercise Price
Expiration( years)			5 years
Risk free interest rate			1.79%
Volatility			61.00%
Dividend %			0.00%