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Derivative Warrant Liabilities - Schedule of Valuation of Derivative Warrant Liabilities (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Balances at December 31, 2017				$ 28
Exercised
Expiration	[1]
Changes in fair value		$ (1)	$ (187)	(14)	$ (275)
Balances at March 31, 2018		14		14
Series A (2011) [Member]
Balances at December 31, 2017
Exercised
Expiration
Changes in fair value
Balances at March 31, 2018
Series A (2013) [Member]
Balances at December 31, 2017
Exercised
Expiration
Changes in fair value
Balances at March 31, 2018
Series A (2013) [Member]
Balances at December 31, 2017
Exercised
Expiration
Changes in fair value
Balances at March 31, 2018
Series A (2015) [Member]
Balances at December 31, 2017
Exercised
Expiration
Changes in fair value
Balances at March 31, 2018
Series A (2016) [Member]
Balances at December 31, 2017	[1]
Exercised
Expiration
Changes in fair value	[1]
Balances at March 31, 2018
Series B (2016) [Member]
Balances at December 31, 2017				28
Exercised
Expiration
Changes in fair value				(14)
Balances at March 31, 2018		$ 14		$ 14
[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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875

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