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Derivative Warrant Liabilities - Schedule of Valuation of Derivative Warrant Liabilities (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Balances at December 31, 2017		$ 28
Exercised
Cancelled
Changes in fair value		(13)	$ (88)
Balances at March 31, 2018		15
Series A (2011) [Member]
Balances at December 31, 2017
Exercised
Cancelled
Changes in fair value
Balances at March 31, 2018
Series A (2013) [Member]
Balances at December 31, 2017
Exercised
Cancelled
Changes in fair value
Balances at March 31, 2018
Series A (2013) [Member]
Balances at December 31, 2017
Exercised
Cancelled
Changes in fair value
Balances at March 31, 2018
Series A (2015) [Member]
Balances at December 31, 2017
Exercised
Cancelled
Changes in fair value
Balances at March 31, 2018
Series A (2016) [Member]
Balances at December 31, 2017	[1]
Exercised
Cancelled
Changes in fair value	[1]
Balances at March 31, 2018
Series B (2016) [Member]
Balances at December 31, 2017		28
Exercised
Cancelled
Changes in fair value		(13)
Balances at March 31, 2018		$ 15
[1] Less than 1

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Derivative warrant liabilities.

+ References

No definition available.

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- Definition

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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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