Funds Received from Sale of Income Tax Net Operating Losses (Details Narrative) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Jan. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal [Member]
Net operating loss carryforwards		$ 174,000
Description of operating loss carryforwards		expiring in the years 2018 through 2036
Pennsylvania Division of Tax [Member]
Net operating loss carryforwards	$ 36,000
Description of operating loss carryforwards	expiring in the years 2018 through 2033
New Jersey Division of Taxation [Member]
Net operating loss carryforwards	$ 8,000	$ 14,000	$ 16,000
Description of operating loss carryforwards	expiring in 2036
Approximate value of operating loss carryforwards				$ 1,120	$ 1,320
Research and development credits				$ 189	$ 241