Background and Basis of Presentation (Details Narrative) - USD ($) $ in Thousands		12 Months Ended
	Feb. 21, 2017	Dec. 31, 2018	Dec. 31, 2017	Jan. 23, 2017
Basis of Presentation [Line Items]
Reverse stock split	1:10 reverse split
Common stock, shares authorized	100,000,000	10,000,000	10,000,000
Negative working capital		$ (200)
Increase (decrease) in expected cash flows		$ 4,900
Plan to reduce corporate cost		50.00%
Alternative minimum tax refund		$ 1,100
Pension contributions yet to be paid		2,100
Cash balance and short-term investments		4,900
Monetizing investment in arrive		4,000
Corporate Expense Settlement [Member]
Basis of Presentation [Line Items]
Cash balance and short-term investments		2,000
Pension Obligation Funding Costs Arrangement [Member]
Basis of Presentation [Line Items]
Cash balance and short-term investments		4,000
Legal Settlement Payment to CMC [Member]
Basis of Presentation [Line Items]
Cash balance and short-term investments		1,000
Legal Settlement Payment to Others [Member]
Basis of Presentation [Line Items]
Cash balance and short-term investments		500
March 31, 2019 [Member]
Basis of Presentation [Line Items]
Proceeds from escrow		$ 950
NXSN Acquisition Corp. [Member]
Basis of Presentation [Line Items]
Noncontrolling interest, percentage held by noncontrolling owners				50.00%
Senior secured convertible promissory note				$ 25,000
Noncontrolling interest, percentage held by parent				50.00%
Equity interest percentage				100.00%