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STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2014

STOCKHOLDERS' EQUITY

Schedule of warrants outstanding to purchase common stock and classified as equity

As of December 31, 2014, the following warrants to purchase our common stock were outstanding and classified as equity:

Issuance Date		Exercise Price			Number of Shares			Exercisable Date		Expiration Date
August 2011(1)		$	3.98			537,893		August 2011		August 2021
April 2005		$	3.75			470,000		April 2005		April 2015
​	​	​	​	​	​	​	​	​	​	​
						1,007,893
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(1) In connection with each disbursement under the loan agreement with CIRM, we were obligated to issue to CIRM a warrant to purchase Geron common stock. Such warrants and the underlying common stock were unregistered. We have no further obligations to issue any additional warrants to CIRM. In December 2014, CIRM exercised a warrant to purchase 461,382 shares of our common stock utilizing the net exercise provision in the warrant resulting in the issuance of 168,039 shares of our common stock.

Schedule of aggregate option and award activity

Outstanding Options

Shares Available For Grant

Number of Shares

Weighted Average Exercise Price Per Share

Weighted Average Remaining Contractual Life (In years)

Aggregate Intrinsic Value (In thousands)

Balance at December 31, 2013

16,207,250

15,576,216

$

3.04

$

33,798

Options granted

(5,658,931

)

5,658,931

$

4.85

Awards granted

(59,330

)

—

$

—

Options exercised

—

(662,626

)

$

1.94

Options cancelled/forfeited

3,613,577

(3,613,577

)

$

5.48

Awards cancelled/forfeited

142,375

—

$

—

2006 Directors Plan termination

(860,058

)

—

$

—

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Balance at December 31, 2014

13,384,883

16,958,944

$

3.16

7.38

$

16,038

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Options exercisable at December 31, 2014

9,129,576

$

3.12

6.47

$

9,231

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Options fully vested and expected to vest at December 31, 2014

16,225,022

$

3.14

7.32

$

15,546

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Schedule of information about stock options outstanding by exercise price range

        Information about stock options outstanding as of December 31, 2014 is as follows:

		Options Outstanding
Exercise Price Range		Number of Shares			Weighted Average Exercise Price Per Share			Weighted Average Remaining Contractual Life (In years)
$1.10 - $1.50			4,284,937		$	1.42			7.41
$1.51 - $2.14			4,278,382		$	1.64			7.84
$2.16 - $5.01			5,376,639		$	4.29			7.91
$5.05 - $9.32			3,018,986		$	5.80			5.72
​	​	​	​	​	​	​	​	​	​	​
$1.10 - $9.32			16,958,944		$	3.16			7.38
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​	​	​	​	​	​	​	​	​	​	​

Schedule of aggregate restricted stock activity

		Number of Shares			Weighted Average Grant Date Fair Value Per Share			Weighted Average Remaining Contractual Term (In years)
Non-vested restricted stock at December 31, 2013			409,437		$	4.84			0.82
Granted			59,330		$	2.67
Vested			(265,422	)	$	4.47
Cancelled/forfeited			(142,375	)	$	4.66
​	​	​	​	​	​	​	​	​	​	​
Non-vested restricted stock at December 31, 2014			60,970		$	4.73			0.37
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​	​	​	​	​	​	​	​	​	​	​

Summary of allocation of stock-based compensation expense related to share-based payment awards

		Year Ended December 31,
(In thousands)		2014			2013			2012
Research and development		$	2,545		$	1,741		$	2,336
Restructuring charges			—			28			107
General and administrative			5,113			2,666			2,868
​	​	​	​	​	​	​	​	​	​	​
Stock-based compensation expense included in operating expenses		$	7,658		$	4,435		$	5,311
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​	​	​	​	​	​	​	​	​	​	​

Schedule of assumptions used to estimate the fair value of stock options granted

		2014		2013		2012
Dividend yield		0%		0%		0%
Expected volatility range		0.898 to 0.922		0.742 to 0.792		0.631 to 0.740
Risk-free interest rate range		1.64% to 1.92%		0.80% to 1.97%		0.81% to 1.25%
Expected term		5.5 yrs		6 yrs		6 yrs

Schedule of assumptions used to estimate the fair value of employee stock purchases under the Purchase Plans

		2014		2013		2012
Dividend yield		0%		0%		0%
Expected volatility range		0.835 to 1.666		0.506 to 1.391		0.458 to 0.774
Risk-free interest rate range		0.06% to 0.15%		0.09% to 0.21%		0.06% to 0.21%
Expected term range		6 mos to 12 mos		6 mos to 12 mos		6 mos to 12 mos

Schedule of common stock reserved for future issuance

        Common stock reserved for future issuance as of December 31, 2014 is as follows:

Outstanding stock options			16,958,944
Options and awards available for grant			13,384,883
Employee stock purchase plan			975,625
Warrants outstanding			1,007,893
​	​	​	​	​
Total			32,327,345
​	​	​	​	​
​	​	​	​	​

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