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Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2016
Schedule of Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Less change in fair value of warrant liability | $ 0 | $ 190 | $ 0 | $ 612 |
Investments, Fair Value Disclosure | $ 1,600 |  | $ 1,600 |  |
Warrant Expiration Date |  |  | Apr. 18, 2018 |  |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |
Schedule of Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred Tax Assets Unrecognized Tax Benefit |  |  |  |  | $ 12,000

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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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