Income Taxes (FASB ASC 740 Income Taxes) (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Federal [Member]
Effective federal statutory rate reduction	21.00%	35.00%
Net operating loss carryforwards	$ 183,000
Net operating loss carryforwards with no expiration date	$ 7,000
Description of operating loss carryforwards	expiring in the years 2019 through 2037
Pennsylvania Division of Tax [Member]
Net operating loss carryforwards	$ 34,000
Description of operating loss carryforwards	expiring in the years 2019 through 2033
New Jersey Division of Taxation [Member]
Net operating loss carryforwards	$ 10,000
Description of operating loss carryforwards	expiring in 2038
New Jersey Division of Taxation [Member] | 2017 TaxYear [Member]
Net operating loss carryforwards	$ 10,000
Approximate value of operating loss carryforwards	$ 859
New Jersey Division of Taxation [Member] | 2016 TaxYear [Member]
Net operating loss carryforwards		$ 8,000
Approximate value of operating loss carryforwards		622
Research and development credits		$ 169