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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2013
Equity [Abstract] |
Summary of Stock Option Activity | A summary of Sangamo’s stock option activity is as follows:
|  | Number of Shares |  |  | Weighted- Average Exercise per Share Price |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
|  |  |  |  |  |  |  | (In years) |  |  | (In thousands) |
Options outstanding at December 31, 2012 |  |  | 9,184,346 |  |  | $ | 6.21 |  |  |  | 6.46 |  |  |  |  |
Options granted |  |  | 1,119,200 |  |  | $ | 11.75 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (1,715,123 | ) |  | $ | 4.74 |  |  |  |  |  |  |  |  |
Options canceled |  |  | (182,559 | ) |  | $ | 8.50 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2013 |  |  | 8,405,864 |  |  | $ | 7.20 |  |  |  | 6.26 |  |  | $ | 56,425 |
Options vested and expected to vest at December 31, 2013 |  |  | 8,046,932 |  |  | $ | 7.10 |  |  |  | 6.12 |  |  | $ | 54,849 |
Options exercisable at December 31, 2013 |  |  | 5,800,931 |  |  | $ | 6.84 |  |  |  | 5.05 |  |  | $ | 41,073 |
Summary of Stock Options Outstanding | The following table summarizes information with respect to stock options outstanding at December 31, 2013:
|  | Options Outstanding and Exercisable |  |  | Options Exercisable |
Range of Exercise Price |  | Number of Shares of common stock subject to options |  |  | Weighted Average Remaining Contractual Life |  |  | Number of Shares of common stock subject to options |  |  | Weighted Average Exercise Price |
|  |  |  |  | (In years) |  |  |  |  |  |  |
$2.55 – $3.25 |  |  | 212,844 |  |  |  | 7.77 |  |  |  | 59,647 |  |  | $ | 2.57 |
$3.45 – $3.45 |  |  | 1,124,381 |  |  |  | 4.94 |  |  |  | 1,124,381 |  |  | $ | 3.45 |
$3.80 – $5.26 |  |  | 661,565 |  |  |  | 3.33 |  |  |  | 596,146 |  |  | $ | 4.54 |
$5.35 – $5.35 |  |  | 909,866 |  |  |  | 5.92 |  |  |  | 909,866 |  |  | $ | 5.35 |
$5.41 – $5.41 |  |  | 1,134,524 |  |  |  | 8.89 |  |  |  | 270,040 |  |  | $ | 5.41 |
$5.42 – $5.66 |  |  | 60,500 |  |  |  | 5.24 |  |  |  | 60,500 |  |  | $ | 5.46 |
$5.70 – $5.70 |  |  | 945,120 |  |  |  | 6.93 |  |  |  | 676,970 |  |  | $ | 5.70 |
$5.86 – $6.82 |  |  | 899,022 |  |  |  | 5.12 |  |  |  | 749,020 |  |  | $ | 6.45 |
$6.92 – $11.99 |  |  | 365,342 |  |  |  | 5.42 |  |  |  | 267,361 |  |  | $ | 8.68 |
$12.12 – $14.62 |  |  | 2,092,700 |  |  |  | 6.83 |  |  |  | 1,087,000 |  |  | $ | 14.05 |
|  |  | 8,405,864 |  |  |  | 6.26 |  |  |  | 5,800,931 |  |  | $ | 6.84 |
Summary of Restricted Stock Unit Activity | A summary of Sangamo’s RSU activity is as follows:
|  | Number of Shares |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
|  |  |  |  | (In years) |  |  | (In thousands) |
RSUs outstanding at December 31, 2012 |  |  | 1,036,750 |  |  |  |  |  |  |  |  |
RSUs awarded |  |  | 392,500 |  |  |  |  |  |  |  |  |
RSUs released |  |  | (341,843 | ) |  |  |  |  |  |  |  |
RSUs forfeited |  |  | (23,750 | ) |  |  |  |  |  |  |  |
RSUs outstanding at December 31, 2013 |  |  | 1,063,657 |  |  |  | 1.46 |  |  | $ | 14,774 |
RSUs vested and expected to vest at December 31, 2013 |  |  | 925,882 |  |  |  | 1.43 |  |  | $ | 12,860 |

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