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Derivative Warrant Liabilities - Schedule of Valuation of Derivative Warrant Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balances at December 31, 2017 | [1] | $ 28 |  | $ 313 |  |  |
Exercised |  |  |  |  | [1] |  |
Expiration |  |  | [2] |  | [1] |  |
Changes in fair value |  | (23) |  | (285) | [1] | $ (262) |
Balances at September 30, 2018 |  | 5 |  | 28 | [1] | 313 | [1]
Series A (2011) [Member] |  |  |  |  |  |  |
Balances at December 31, 2017 | [1] |  |  |  |  |  |
Exercised |  |  |  |  | [1] |  |
Expiration |  |  |  |  | [1] |  |
Changes in fair value |  |  |  |  | [1] |  |
Balances at September 30, 2018 |  |  |  |  | [1] |  | [1]
Series A (2013) [Member] |  |  |  |  |  |  |
Balances at December 31, 2017 | [1] |  |  | 12 |  |  |
Exercised |  |  |  |  | [1] |  |
Expiration |  |  |  |  | [1] |  |
Changes in fair value |  |  |  | (12) | [1] |  |
Balances at September 30, 2018 |  |  |  |  | [1] | 12 | [1]
Series A (2013) [Member] |  |  |  |  |  |  |
Balances at December 31, 2017 | [1] |  |  | 9 |  |  |
Exercised |  |  |  |  | [1] |  |
Expiration |  |  |  |  | [1] |  |
Changes in fair value |  |  |  | (9) | [1] |  |
Balances at September 30, 2018 |  |  |  |  | [1] | 9 | [1]
Series A (2015) [Member] |  |  |  |  |  |  |
Balances at December 31, 2017 | [1] |  |  | 22 |  |  |
Exercised |  |  |  |  | [1] |  |
Expiration |  |  |  |  | [1] |  |
Changes in fair value |  |  |  | (22) | [1] |  |
Balances at September 30, 2018 |  |  |  |  | [1] | 22 | [1]
Series A (2016) [Member] |  |  |  |  |  |  |
Balances at December 31, 2017 | [1] |  | [2] | 43 |  |  |
Exercised |  |  |  |  | [1] |  |
Expiration |  |  | [2] |  | [1] |  |
Changes in fair value |  |  |  | (43) | [1] |  |
Balances at September 30, 2018 |  |  |  |  | [1],[2] | 43 | [1]
Series B (2016) [Member] |  |  |  |  |  |  |
Balances at December 31, 2017 | [1] | 28 |  | 227 |  |  |
Exercised |  |  |  |  | [1] |  |
Expiration |  |  |  |  | [1] |  |
Changes in fair value |  | (23) |  | (199) | [1] |  |
Balances at September 30, 2018 |  | $ 5 |  | $ 28 | [1] | $ 227 | [1]
[1] | Share data represents the number of shares adjusted to retroactively reflect the 1:15 Reverse Split effected on September 4, 2018.
[2] | 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://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 + Details
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