Business Segment Data (Details) - Business Segment Data - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenues:
Revenues	$ 3,062	$ 3,978	$ 7,597	$ 7,055
Operating income (loss):
Operating income (loss)	(894)	(1,093)	(755)	(2,189)
Interest expense, net	(218)	(138)	(414)	(312)
Gain (loss) on foreign currency remeasurement	50	(64)	122	(91)
Gain on sale leaseback transaction		33	11	66
Pension benefit	34	8	68	17
Loss before income taxes	(1,028)	(1,254)	(968)	(2,509)
Income tax expense
Net loss	(1,028)	(1,254)	(968)	(2,509)
Assets
Assets	12,702	12,703	12,702	12,703	$ 14,984
Digital Product Sales [Member]
Revenues:
Revenues	2,353	3,360	6,301	5,940
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	709	618	1,296	1,115
Operating Segments [Member]
Assets
Assets		12,439		12,439	14,237
Operating Segments [Member] | Digital Product Sales [Member]
Revenues:
Revenues	2,353	3,360	6,301	5,940
Operating income (loss):
Operating income (loss)	(442)	(512)	118	(988)
Assets
Assets		8,474		8,474	9,722
Operating Segments [Member] | Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	709	618	1,296	1,115
Operating income (loss):
Operating income (loss)	258	187	548	258
Assets
Assets		3,965		3,965	4,515
Corporate, Non-Segment [Member]
Operating income (loss):
Operating income (loss)	$ (710)	(768)	$ (1,421)	(1,459)
Assets
Assets		$ 264		$ 264	$ 747