Revenue Recognition (Details) - Disaggregation of revenue from contracts with customers - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Digital product sales:
Revenue from contracts with customers	$ 1,913	$ 3,599
Digital Product Sales [Member]
Digital product sales:
Revenue from contracts with customers	1,334	3,091
Digital Product Lease And Maintenance [Member]
Digital product sales:
Revenue from contracts with customers	579	508
Catalog And Small Customized Products [Member] \| Digital Product Sales [Member]
Digital product sales:
Revenue from contracts with customers	1,334	3,091
Large Customized Products [Member] \| Digital Product Sales [Member]
Digital product sales:
Revenue from contracts with customers
Operating Leases [Member] \| Digital Product Lease And Maintenance [Member]
Digital product sales:
Revenue from contracts with customers	279	292
Maintenance Agreements [Member] \| Digital Product Lease And Maintenance [Member]
Digital product sales:
Revenue from contracts with customers	$ 300	$ 216

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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+ Details