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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Revenue Recognition - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of revenue
Total revenue	$ 40,030	$ 41,456	$ 109,857	$ 109,523
Deferred Revenue
Revenue recognized			1,600
Product
Disaggregation of revenue
Total revenue	19,611	22,482	53,021	58,125
Service
Disaggregation of revenue
Total revenue	20,419	18,974	56,836	51,398
Marketplaces
Disaggregation of revenue
Total revenue	23,327	24,712	63,354	65,334
Marketplaces \| Product
Disaggregation of revenue
Total revenue	19,611	22,482	53,021	58,125
Marketplaces \| Service
Disaggregation of revenue
Total revenue	3,716	2,230	10,333	7,209
Media
Disaggregation of revenue
Total revenue	16,703	16,744	46,503	44,189
Media \| Service
Disaggregation of revenue
Total revenue	$ 16,703	$ 16,744	$ 46,503	$ 44,189