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SUBSEQUENT EVENT	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
SUBSEQUENT EVENT	5. SUBSEQUENT EVENT Effective October 1, 2018, our Board of Directors, or the Board, adopted a Directors’ Market Value Stock Purchase Plan, or the Directors Market Plan. Under the Directors Market Plan, non-employee members of the Board may purchase shares of Geron common stock at the prevailing market price on the purchase date with cash compensation payable to them for their services as a Board member. As stated in Geron’s Non-Employee Director Compensation Policy, each non-employee member of the Board receives annual cash compensation, payable quarterly in arrears, for their services on the Board and various committees of the Board. As provided in the Non-Employee Director Compensation Policy, a board member may elect to receive fully vested shares of common stock in lieu of cash and such shares shall be issuable from the Directors Market Plan. A total of 1,000,000 shares of common stock has been reserved for the Directors Market Plan. The Directors Market Plan is intended to qualify for the limited exemption from stockholder approval pursuant to Nasdaq Listing 5635(c)(2), as a plan that merely provides a convenient way to purchase shares from the Company at market value.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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