Revenue Recognition (Details) - Disaggregation of revenue from contracts with customers - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,865,000	$ 2,896,000	$ 8,338,000	$ 6,858,000
Digital Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,393,000	2,405,000	6,882,000	5,257,000
Digital Product Lease And Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	472,000	491,000	1,456,000	1,601,000
Catalog And Small Customized Products [Member] | Digital Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,393,000	2,405,000	6,882,000	5,257,000
Large Customized Products [Member] | Digital Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers
Operating Leases [Member] | Digital Product Lease And Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	196,000	240,000	615,000	755,000
Maintenance Agreements [Member] | Digital Product Lease And Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 276,000	$ 251,000	$ 841,000	$ 846,000