Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	21.00%	35.00%
Operating Loss Carryforwards, Limitations on Use	At December 31, 2018, the Company had federal net operating loss carryforwards of approximately $100.6 million that expire in the years 2025 through 2036, and New Jersey state net operating loss carryforwards of approximately $22.9 million that expire in the years 2030 through 2038. The Company had federal and state capital loss carryforwards of approximately $1.2 million that expired in 2018. The Company also had federal research and development (“R&D”) credit carryforwards of approximately $400,000 that expired in 2018. The Company has remaining R&D credit carryforwards of approximately $16.2 million that expire in the years 2019 through 2029. These deferred tax assets had been subject to a valuation allowance such that the deferred tax expense incurred as a result of the expiration of the capital loss and R&D credit carryforwards was offset in full by a corresponding deferred tax benefit for the related reduction in valuation allowance. The Company’s ability to use the net operating loss and R&D tax credit carryforwards may be limited, as it is subject to certain limitations due to ownership changes as defined by rules pursuant to Section 382 of the Internal Revenue Code of 1986, as amended.
Refund of Tax Credit Description	In addition, the Act repealed the corporate alternative minimum tax (“AMT”) for years beginning after December 31, 2017 and allowed companies with existing alternative minimum tax credit (“MTC”) carryforwards as of December 31, 2017 to receive refunds of the credits in tax years after 2017 and before 2022 in an amount equal to 50% (100% in 2021) of the excess MTC over the amount of the credit allowable each year against regular tax liability.
Increase (Decrease) in Deferred Income Taxes		$ 15,900,000
Income Taxes Receivable, Current	$ 970,000	0
Income Taxes Receivable, Noncurrent	970,000	1,940,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ 5,855,000	$ 7,008,000
Tax Credit Carryforward, Limitations on Use	net operating losses generated in tax years beginning after December 31, 2017 have an unlimited carryforward period, and the amount of net operating loss allowed to be utilized each year is limited to 80% of taxable income
Tax Credit Carryforward, Amount	$ 16,200,000
Research Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Limitations on Use	The Company has remaining R&D credit carryforwards of approximately $16.2 million that expire in the years 2019 through 2029
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 100,600,000
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	400,000
New Jersey Division of Taxation [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	22,900,000
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 1,200,000