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The Company, Fair Value Measurements (Details) - Level 3 [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |
Beginning balance | $ 0 | $ 3
Increase (decrease) in fair value | 0 | (1)
Ending balance | 0 | 2
October 31, 2013 - Warrants [Member] |  |
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |
Beginning balance | 0 | 2
Increase (decrease) in fair value | 0 | (1)
Ending balance | $ 0 | 1
February 5, 2014 - Warrants [Member] |  |
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |
Beginning balance |  | 1
Increase (decrease) in fair value |  | 0
Ending balance |  | $ 1

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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