Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Summary of Stock Option Activity

A summary of Sangamo’s stock option activity is as follows:

				Weighted-
				Average		Weighted Average		Aggregate
	Number of			Exercise per		Remaining		Intrinsic
	Shares			Share Price		ContractualTerm		Value
						(In years)		(Inthousands)
Options outstanding at December 31, 2014		8,006,380		$	8.90
Options granted		1,628,402		$	9.95
Options exercised		(949,252	)	$	6.21
Options canceled		(508,162	)	$	11.91
Options outstanding at December 31, 2015		8,177,368		$	9.24		6.56	$	14,074
Options vested and expected to vest at December 31, 2015		7,752,480		$	9.15		6.40	$	14,042
Options exercisable at December 31, 2015		4,950,680		$	7.97		4.92	$	13,119

Summary of Stock Options Outstanding

The following table summarizes information with respect to stock options outstanding at December 31, 2015:

	OptionsOutstanding and Exercisable				Options Exercisable
	Number of				Number of
	Shares of				Shares of
	commonstock		Weighted Average		common stock
	subject to		Remaining		subject to		Weighted Average
Range of Exercise Price	options		Contractual Life		options		Exercise Price
			(In years)
$2.55 – $5.35		1,486,569		3.72		1,484,693	$	4.35
$5.41 – $5.41		826,984		6.79		598,837	$	5.41
$5.42 – $5.94		1,001,858		5.07		1,001,858	$	5.76
$6.05 – $9.40		308,171		6.16		193,003	$	7.00
$9.41 – $9.41		1,229,402		9.94		—	$	—
$9.45 – $12.12		967,099		7.82		472,328	$	11.87
$12.23 – $13.99		702,135		4.31		521,809	$	13.83
$14.07 – $14.07		1,019,650		8.91		258,665	$	14.07
$14.15 – $19.80		629,500		5.66		416,862	$	14.69
$23.02 – $23.02		6,000		8.21		2,625	$	23.02
		8,177,368		6.56		4,950,680	$	7.97

Summary of Restricted Stock Unit Activity

A summary of Sangamo’s RSU activity is as follows:

	Number			Weighted Average
	of			Remaining		Aggregate Intrinsic
	Shares			Contractual Term		Value
				(In years)		(In thousands)
RSUs outstanding at December 31, 2014		899,402
RSUs awarded		446,000
RSUs released		(387,588	)
RSUs forfeited		(126,997	)
RSUs outstanding at December 31, 2015		830,817			1.63	$	7,585
RSUs vested and expected to vest at December 31, 2015		718,502			1.61	$	6,560