Revenue Recognition (Details) - Disaggregation of revenue from contracts with customers - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,450	$ 10,326	$ 11,047	$ 17,381
Digital Product Lease And Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	593	650	1,889	1,765
Catalog And Small Customized Products [Member] | Digital Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,857	5,270	8,158	11,210
Large Customized Products [Member] | Digital Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		4,406	1,000	4,406
Digital Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,857	$ 9,676	$ 9,158	$ 15,616