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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
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 |  |  | Contractual Term |  |  | Value |
|  |  |  |  |  |  |  |  |  | (In years) |  |  | (In thousands) |
Options outstanding at December 31, 2015 |  |  | 8,177,368 |  |  | $ | 9.24 |  |  |  |  |  |  |  |  |
Options granted |  |  | 1,995,000 |  |  | $ | 5.39 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (72,843 | ) |  | $ | 4.05 |  |  |  |  |  |  |  |  |
Options canceled |  |  | (843,019 | ) |  | $ | 10.79 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2016 |  |  | 9,256,506 |  |  | $ | 8.31 |  |  |  | 5.52 |  |  | $ | 41 |
Options vested and expected to vest at December 31, 2016 |  |  | 8,837,719 |  |  | $ | 8.39 |  |  |  | 5.35 |  |  | $ | 41 |
Options exercisable at December 31, 2016 |  |  | 6,034,569 |  |  | $ | 8.54 |  |  |  | 3.85 |  |  | $ | 41 |
Summary of Stock Options Outstanding | The following table summarizes information with respect to stock options outstanding at December 31, 2016:
|  | Options Outstanding and Exercisable |  |  | Options Exercisable |
|  | Number of |  |  |  |  |  |  | Number of |  |  |  |  |
|  | Shares of |  |  |  |  |  |  | Shares of |  |  |  |  |
|  | common stock |  |  | 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 – $3.45 |  |  | 1,226,700 |  |  |  | 5.52 |  |  |  | 681,700 |  |  | $ | 3.34 |
$3.55 – $5.35 |  |  | 1,103,291 |  |  |  | 4.86 |  |  |  | 755,291 |  |  | $ | 5.32 |
$5.36 – $5.70 |  |  | 1,545,209 |  |  |  | 4.04 |  |  |  | 1,481,209 |  |  | $ | 5.54 |
$5.72 – $7.07 |  |  | 1,295,575 |  |  |  | 6.66 |  |  |  | 417,616 |  |  | $ | 6.06 |
$7.24 – $9.40 |  |  | 165,596 |  |  |  | 7.00 |  |  |  | 93,517 |  |  | $ | 8.12 |
$9.41 – $9.41 |  |  | 1,018,710 |  |  |  | 8.14 |  |  |  | 349,418 |  |  | $ | 9.41 |
$9.45 – $12.80 |  |  | 931,334 |  |  |  | 5.75 |  |  |  | 743,227 |  |  | $ | 11.89 |
$12.96 – $14.07 |  |  | 1,398,591 |  |  |  | 4.97 |  |  |  | 1,032,356 |  |  | $ | 14.00 |
$14.15 – $19.51 |  |  | 559,000 |  |  |  | 4.04 |  |  |  | 471,642 |  |  | $ | 14.78 |
$19.80 – $19.80 |  |  | 12,500 |  |  |  | 7.23 |  |  |  | 8,593 |  |  | $ | 19.80 |
|  |  | 9,256,506 |  |  |  | 5.52 |  |  |  | 6,034,569 |  |  | $ | 8.54 |
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, 2015 |  |  | 830,817 |  |  |  |  |  |  |  |  |
RSUs awarded |  |  | 60,000 |  |  |  |  |  |  |  |  |
RSUs released |  |  | (406,921 | ) |  |  |  |  |  |  |  |
RSUs forfeited |  |  | (162,080 | ) |  |  |  |  |  |  |  |
RSUs outstanding at December 31, 2016 |  |  | 321,816 |  |  |  | 1.41 |  |  | $ | 982 |
RSUs vested and expected to vest at December 31, 2016 |  |  | 294,226 |  |  |  | 1.40 |  |  | $ | 897 |

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