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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Abstract] |  |  |  |
Reduction in deferred tax asset |  | $ 6,800 |  |
Deferred liabilities [Abstract] |  |  |  |
Available-for-sale securities |  | 0 | $ (761) |
Total deferred tax liabilities |  | 0 | (761) |
Deferred tax assets [Abstract] |  |  |  |
Net operating loss carryforwards |  | 11,414 | 11,730 |
Research and development credit carryforwards |  | 2,141 | 1,765 |
Patents and fixed assets |  | 268 | 179 |
Stock-based compensation and accrued payroll |  | 1,260 | 1,041 |
Valuation Allowance |  | (15,083) | (13,954) |
Total deferred tax assets |  | 0 | 761 |
Net deferred tax asset (liability) |  | $ 0 | $ 0 |
Income Tax Reconciliation [Abstract] |  |  |  |
Computed tax benefit at federal statutory rate |  | 34.00% | 34.00% | 34.00%
Re-rate of federal net deferred tax assets |  | (35.00%) | 0.00% | 0.00%
Permanent differences |  | (8.00%) | (1.00%) | (9.00%)
State tax benefit |  | 3.00% | 2.00% | 15.00%
Research and development credits |  | 1.00% | 2.00% | 2.00%
Other |  | 0.00% | 7.00% | 3.00%
Adjusted basis for available-for-sale-securities |  | 11.00% | 0.00% | 0.00%
Change in valuation allowance |  | (6.00%) | (44.00%) | (45.00%)
Total |  | 0.00% | 0.00% | 0.00%
Class of Stock [Line Items] |  |  |  |
Company share in market transactions (in shares) |  | 31,452,000 | 28,737,000 |
Change in valuation allowance |  | $ 1,100 | $ 5,100 |
Percentage of change in ownership |  | 50.00% |  |
Period in which change of ownership for a specified percentage should occur |  | 3 years |  |
Research Tax Credit Carryforward [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforwards, federal |  | $ 1,000 |  |
Tax credit carryforwards, state |  | $ 1,100 |  |
Research Tax Credit Carryforward [Member] | Minimum [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforwards, expiration date, federal |  | Dec. 31, 2030 |  |
Research Tax Credit Carryforward [Member] | Maximum [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforwards, expiration date, federal |  | Dec. 31, 2037 |  |
Plan [Member] |  |  |  |
Income Tax Reconciliation [Abstract] |  |  |  |
Computed tax benefit at federal statutory rate | 21.00% |  |  |
Federal [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards |  | $ 47,800 |  |
Federal [Member] | Minimum [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards, expiration date |  | Dec. 31, 2030 |  |
Federal [Member] | Maximum [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards, expiration date |  | Dec. 31, 2037 |  |
State [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards |  | $ 15,600 |  |
State [Member] | Minimum [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards, expiration date |  | Dec. 31, 2029 |  |
State [Member] | Maximum [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards, expiration date |  | Dec. 31, 2037 |  |
BioTime, Inc. [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Company share in market transactions (in shares) |  | 266,442 | 0 | 259,712
Investors taxable loss |  | $ (301) |  | $ (397)

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