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Organization, Description of the Business and Liquidity (Details) - USD ($) $ in Thousands | Mar. 28, 2018 | Dec. 31, 2017 | Feb. 17, 2017 | Dec. 31, 2016 | Aug. 29, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity ownership percentage |  |  |  |  | 51.20% |  |
Accumulated deficit |  | $ (54,677) |  | $ (35,302) |  |  |
Cash and cash equivalents |  | 7,600 |  | 10,174 |  | $ 7,996 | $ 257
BioTime shares held as available-for-sale securities, at fair value |  | 760 |  | $ 2,237 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Gross proceeds from private placement | $ 10,000 |  |  |  |  |  |
Subsequent Event [Member] | Investor One [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Gross proceeds from private placement | 8,000 |  |  |  |  |  |
Subsequent Event [Member] | Investor Two [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Gross proceeds from private placement | $ 2,000 |  |  |  |  |  |
BioTime, Inc. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity ownership percentage |  |  | 50.00% | 51.10% |  |  |
BioTime shares held as available-for-sale securities, at fair value |  | $ 800 |  |  |  |  |

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- Definition Amount of investments in equity securities and other forms of securities that provide ownership interests classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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