Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 22, 2017	Dec. 31, 2019	Dec. 31, 2018
Income tax expense		$ 22	$ 24
State tax net of federal benefit		(7.60%)	(7.70%)
Amount of unrecognized or expected tax benefits recorded in financial statement		$ 1,100	$ 1,100
Investment tax credits and research and development credits scheduled to expire		2019
Increase (decrease) in foreign with holding taxes payable		$ 22	$ 24
Deferred tax assets and liabilities		10,300
Research [Member]
Tax credit carry forward amount		66
Investment Credit [Member]
Tax credit carry forward amount		23
Federal [Member]
Net operating loss carryforward		188,100
Tax credit carry forward amount		$ 662
Operating loss carry forwards expiration year		2021
Illinois NOL carryforwards [Member]
Net operating loss carryforward		$ 200,000
Operating loss carry forwards expiration year		2020
Maximum [Member]
U.S. corporate tax rate	35.00%
Repatriation tax	$ 5,000
Minimum [Member]
U.S. corporate tax rate	21.00%
Repatriation tax	$ 3,900