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

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

The Company, Adoption of New Accounting Standards (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Statement of Operations [Abstract]
Revenues	$ 7,892	$ 7,285	$ 21,892	$ 22,852
ASU 2014-09 [Member]
Net Assets, Adjusted Balance [Abstract]
Adoption of accounting standard					$ (234)
Balances Without Adoption of ASC 606 [Member] \| ASU 2014-09 [Member]
Statement of Operations [Abstract]
Revenues	7,946		22,006
Effect of Adoption Higher / (Lower) [Member] \| ASU 2014-09 [Member]
Net Assets, Adjusted Balance [Abstract]
Deferred revenue					234
Statement of Operations [Abstract]
Revenues	$ (54)		$ (114)
Effect of Adoption Higher / (Lower) [Member] \| ASU 2014-09 [Member] \| Accumulated Deficit [Member]
Net Assets, Adjusted Balance [Abstract]
Adoption of accounting standard					$ (234)