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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 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 + Details
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