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Summary of Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 10, 2017	Feb. 17, 2017
Money market funds, cash equivalent		$ 32,100	$ 16,800
Certificates deposit		847
Net trade receivable		139	344
Grants receivable		641	102
Allowance for doubtful accounts		$ 422	543
Intangible asset, useful life		10 years
Equity method ownership percentage		20.00%			99.80%
Write down of investment			3,500
Change in foreign currency translation		$ 668	$ (106)	$ (424)
U.S. Federal tax rates	21.00%	27.00%	24.00%	10.00%
Weighted average dilutive common shares used to compute diluted net income per common shares		114,476,000	99,553,000	79,711,000
Restricted Stock Units and Outstanding Stock Options [Member]
Weighted average dilutive common shares used to compute diluted net income per common shares			206,000
Asterias and OncoCyte [Member]
Weighted average dilutive common shares used to compute diluted net income per common shares			2,030,000
Minimum [Member]
Estimated useful life		3 years
Maximum [Member]
Estimated useful life		10 years
Equity method ownership percentage						50.00%
February 13, 2018 [Member] \| Lease Agreement [Member]
Certificates deposit		$ 424