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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Revenue Recognition (Details) - Disaggregation of revenue from contracts with customers - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,062	$ 3,978	$ 7,597	$ 7,055
Digital Product Lease And Maintenance [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	709	618	1,296	1,115
Catalog And Small Customized Products [Member] \| Digital Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,353	3,360	5,301	5,940
Large Customized Products [Member] \| Digital Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers			1,000
Digital Product Sales [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,353	$ 3,360	$ 6,301	$ 5,940