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Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 18, 2015 | Dec. 31, 2018 | Dec. 31, 2017 USD ($) Segment $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Feb. 17, 2017 | Aug. 29, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity ownership percentage |  |  |  |  |  |  | 51.20%
Reverse Stock Split [Abstract] |  |  |  |  |  |  |
Reverse stock split ratio | 0.5 |  |  |  |  |  |
Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |
Cash |  |  | $ 7,600 | $ 10,200 |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Proceeds from sale of common stock |  |  | 0 | 0 | $ 11,649 |  |
Realized loss on sale of BioTime shares |  |  | 0 | 0 | $ 397 |  |
Shares held as available-for-sale securities, at fair value |  |  | $ 760 | 2,237 |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets, useful life |  |  | 10 years |  |  |  |
Impairment of long-lived assets [Abstract] |  |  |  |  |  |  |
Impairment losses |  |  | $ 0 |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Accrued interest and penalties |  |  | $ 0 | $ 0 |  |  |
Federal corporate tax rate |  |  | 34.00% | 34.00% | 34.00% |  |
Computations of Basic and Diluted Net Loss Per Common Share [Abstract] |  |  |  |  |  |  |
Net loss |  |  | $ (19,375) | $ (11,168) | $ (8,735) |  |
Weighted average shares outstanding - basic and diluted (in shares) | shares |  |  | 30,195,000 | 26,529,000 | 21,009,000 |  |
Net loss per common share - basic and diluted (in dollars per share) | $ / shares |  |  | $ (0.64) | $ (0.42) | $ (0.42) |  |
Segments [Abstract] |  |  |  |  |  |  |
Number of operating segments | Segment |  |  | 1 |  |  |  |
Plan [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Federal corporate tax rate |  | 21.00% |  |  |  |  |
Equipment and Furniture [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Equipment and furniture, useful life |  |  | 3 years |  |  |  |
Equipment and Furniture [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Equipment and furniture, useful life |  |  | 10 years |  |  |  |
Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Equipment and furniture, useful life |  |  | 3 years |  |  |  |
Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Equipment and furniture, useful life |  |  | 5 years |  |  |  |
BioTime, Inc. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity ownership percentage |  |  |  | 51.10% |  | 50.00% |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Number of shares sold (in shares) | shares |  |  | 266,442 | 0 | 259,712 |  |
Proceeds from sale of common stock |  |  | $ 934 |  | $ 815 |  |
Realized loss on sale of BioTime shares |  |  | $ (309) |  | $ (397) |  |
Shares held as available-for-sale securities (in shares) | shares |  |  | 353,264 |  |  |  |
Shares held as available-for-sale securities, at fair value |  |  | $ 800 |  |  |  |
Long-lived Intangible Assets [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets, useful life |  |  | 10 years |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | shares |  |  | 3,390,000 | 3,017,000 | 2,240,000 |  |
Warrants [Member] |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | shares |  |  | 2,779,000 | 3,246,000 | 0 |  |

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