Stock-Based Compensation - Components of Stock-Based Compensation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Total stock-based compensation expense	$ 233,000	$ 1,389,000	$ 1,991,000
Tax benefit of stock-based compensation expense	0	0
After-tax effect of stock based compensation	233,000	1,389,000	1,991,000
Stock options
Total stock-based compensation expense	0	120,000	90,000
Restricted stock units
Total stock-based compensation expense	$ 233,000	$ 1,269,000	$ 1,901,000