Revenue - Disaggregated by Geographic Region (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019 USD ($) region	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) region	Sep. 30, 2018 USD ($)
Disaggregation of Revenue
Number of primary geographic regions \| region	3		3
Revenue	$ 9,178	$ 11,518	$ 27,850	$ 37,136
North America
Disaggregation of Revenue
Revenue	1,527	2,104	7,244	6,214
EMEA
Disaggregation of Revenue
Revenue	2,048	2,749	6,776	7,896
APJ
Disaggregation of Revenue
Revenue	$ 5,603	$ 6,665	$ 13,830	$ 23,026

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
-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

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