Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Finite-lived Intangible Assets Amortization Expense [Table Text Block]

Estimated future amortization expense for intangible assets as of December 31, 2019 is as follows:

	For the Year Ending December 31
	(in thousands)
2020	$	1,766
2021	1,766
2022	1,766
2023	1,766
2024	1,766
Thereafter	10,886
	$	19,716

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

	Expected Volatility	Risk-free Interest Rate	Expected Term	Dividend Rate
December 31, 2019:
Employees	88%	2.2%	4	0	%
Officers and non-employee directors	77%	2.6%	8	0	%
December 31, 2018:
Employees	58%	2.6%	4	0	%
Officers and non-employee directors	63%	2.8%	8	0	%
December 31, 2017:
Employees	61%	1.7%	4	0	%
Officers and non-employee directors	70%	2.2%	8	0	%