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Derivative Warrant Liabilities - Schedule of Valuation of Derivative Warrant Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Balances at December 31, 2017 |  | $ 28 |
Exercised |  |  |
Expired | [1] |  |
Changes in fair value |  | (20) | $ (285)
Balances at December 31, 2018 |  | 8 |
Series A (2011) [Member] |  |  |
Balances at December 31, 2017 |  |  |
Exercised |  |  |
Expired |  |  |
Changes in fair value |  |  |
Balances at December 31, 2018 |  |  |
Series A (2013) [Member] |  |  |
Balances at December 31, 2017 |  |  |
Exercised |  |  |
Expired |  |  |
Changes in fair value |  |  |
Balances at December 31, 2018 |  |  |
Series A (2013) [Member] |  |  |
Balances at December 31, 2017 |  |  |
Exercised |  |  |
Expired |  |  |
Changes in fair value |  |  |
Balances at December 31, 2018 |  |  |
Series A (2015) [Member] |  |  |
Balances at December 31, 2017 |  |  |
Exercised |  |  |
Expired |  |  |
Changes in fair value |  |  |
Balances at December 31, 2018 |  |  |
Series A (2016) [Member] |  |  |
Balances at December 31, 2017 | [1] |  |
Exercised |  |  |
Expired | [1] |  |
Changes in fair value |  |  |
Balances at December 31, 2018 |  |  |
Series B (2016) [Member] |  |  |
Balances at December 31, 2017 |  | 28 |
Exercised |  |  |
Expired |  |  |
Changes in fair value |  | (20) |
Balances at December 31, 2018 |  | $ 8 |
[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://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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