Business Segment Data (Details) - Business Segment Data - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenues:
Revenues	$ 3,450	$ 10,326	$ 11,047	$ 17,381
Operating income (loss):
Operating income (loss)	(2,827)	138	(3,582)	(2,051)
Interest expense, net	(238)	(202)	(652)	(514)
(Loss) gain on foreign currency remeasurement	(48)	(101)	74	(192)
Gain on sale leaseback transaction		33	11	99
Pension benefit	33	9	101	26
Loss before income taxes	(3,080)	(123)	(4,048)	(2,632)
Income tax expense
Net loss	(3,080)	(123)	(4,048)	(2,632)
Assets
Assets	10,788	10,788	10,788	10,788	$ 14,984
Digital Product Sales [Member]
Revenues:
Revenues	2,857	9,676	9,158	15,616
Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	593	650	1,889	1,765
Operating Segments [Member]
Assets
Assets		10,492		10,492	14,237
Operating Segments [Member] | Digital Product Sales [Member]
Revenues:
Revenues	2,857	9,676	9,158	15,616
Operating income (loss):
Operating income (loss)	(1,903)	697	(1,785)	(291)
Assets
Assets		7,231		7,231	9,722
Operating Segments [Member] | Digital Product Lease And Maintenance [Member]
Revenues:
Revenues	593	650	1,889	1,765
Operating income (loss):
Operating income (loss)	241	227	789	485
Assets
Assets		3,261		3,261	4,515
Corporate, Non-Segment [Member]
Operating income (loss):
Operating income (loss)	$ (1,165)	(786)	$ (2,586)	(2,245)
Assets
Assets		$ 296		$ 296	$ 747