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Derivative Warrant Liabilities - Schedule of Valuation of Derivative Warrant Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016
Balances at December 31, 2016	$ 313
Exercised
Cancelled
Changes in fair value	(285)		$ (262)
Balances at December 31, 2017	28		313
Series A (2011) [Member]
Balances at December 31, 2016
Exercised
Cancelled
Changes in fair value
Balances at December 31, 2017
Series A (2013) [Member]
Balances at December 31, 2016	12
Exercised
Cancelled
Changes in fair value	(12)
Balances at December 31, 2017			12
Series A (2013) [Member]
Balances at December 31, 2016	9
Exercised
Cancelled
Changes in fair value	(9)
Balances at December 31, 2017			9
Series A (2015) [Member]
Balances at December 31, 2016	22
Exercised
Cancelled
Changes in fair value	(22)
Balances at December 31, 2017			22
Series A (2016) [Member]
Balances at December 31, 2016	43
Exercised
Cancelled
Changes in fair value	(43)
Balances at December 31, 2017		[1]	43
Series B (2016) [Member]
Balances at December 31, 2016	227
Exercised
Cancelled
Changes in fair value	(199)
Balances at December 31, 2017	$ 28		$ 227
[1] Less than 1

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- Definition

Derivative warrant liabilities.

+ References

No definition available.

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- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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