Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount of gain (loss) on sale or disposal of an equity method investment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 230
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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

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Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Subsequent Events (Details Narrative) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jul. 30, 2019	Dec. 31, 2018
Net proceeds from sale of equity
Gain (loss) realized on sale of equity					$ 3,215
Common stock, outstanding		149,643,000		149,643,000			127,136,000
2012 Equity Incentive Plan [Member] \| Maximum [Member]
Number of shares available for grant		16,000,000		16,000,000
Subsequent Event [Member] \| 2012 Equity Incentive Plan [Member] \| Maximum [Member]
Number of shares available for grant						24,000,000
Subsequent Event [Member] \| OncoCyte [Member]
Number of share sold	2,250,000
Net proceeds from sale of equity	$ 4,200
Gain (loss) realized on sale of equity	$ (1,400)
Percentage of equity ownership	23.90%
Common stock, outstanding	12,400,000
Subsequent Event [Member] \| Hadasit [Member]
Number of share sold	647,397
Net proceeds from sale of equity	$ 1,200
Gain (loss) realized on sale of equity	$ 300
Percentage of equity ownership	8.10%
Common stock, outstanding	900,000