Income Taxes (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments Owned Federal Income Tax Note [Line Items]
Loss before income taxes			$ (13,251,000)	$ (11,754,000)
Effective tax rate for continuing operations			0.00%
Current state tax expense			$ 0	2,000
Unrecognized tax benefits			$ 0	$ 0
Federal statutory effective tax rate	21.00%	35.00%	28.00%	35.00%
Change in tax rate due to the tax reform			$ 858,000
Valuation allowance	$ 17,500,000		17,500,000
Change in valuation allowance			(4,700,000)
Net losses carryforwards used for Federal income tax purposes	69,000,000		69,000,000
Federal income tax effected	14,500,000		14,500,000
Accumulated state net operating loss carryforwards	35,700,000		35,700,000
State income tax effected	1,500,000		1,500,000
Temporary credit loss carryovers	500,000		500,000
Temporary credit tax effected			300,000
Temporary credit offset	39,000		39,000
Alternative minimum tax carryforwards	900,000		900,000
Uncertain tax positions	0		0	$ 0
Interest expense for uncertain tax positions	$ 0		$ 0	$ 0
State and Local Jurisdiction
Investments Owned Federal Income Tax Note [Line Items]
Tax credit carryforward expiration year			2027
Earliest Tax Year
Investments Owned Federal Income Tax Note [Line Items]
Operating loss carryforward expiration year			2021
Earliest Tax Year | State and Local Jurisdiction
Investments Owned Federal Income Tax Note [Line Items]
Accumulated operating loss carryforward expiration year			2031
Latest Tax Year
Investments Owned Federal Income Tax Note [Line Items]
Operating loss carryforward expiration year			2037
Latest Tax Year | State and Local Jurisdiction
Investments Owned Federal Income Tax Note [Line Items]
Accumulated operating loss carryforward expiration year			2037