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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2013 |  |  | 8,405,864 |  |  | $ | 7.20 |  |  |  |  |  |  |  |  |
Options granted |  |  | 1,694,400 |  |  | $ | 14.19 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (1,959,201 | ) |  | $ | 6.17 |  |  |  |  |  |  |  |  |
Options canceled |  |  | (134,683 | ) |  | $ | 8.77 |  |  |  |  |  |  |  |  |
Options outstanding at December 31, 2014 |  |  | 8,006,380 |  |  | $ | 8.90 |  |  |  | 6.62 |  |  | $ | 50,766 |
Options vested and expected to vest at December 31, 2014 |  |  | 7,526,430 |  |  | $ | 8.67 |  |  |  | 6.44 |  |  | $ | 49,437 |
Options exercisable at December 31, 2014 |  |  | 4,929,932 |  |  | $ | 7.21 |  |  |  | 5.07 |  |  | $ | 39,475 |
Summary of Stock Options Outstanding | The following table summarizes information with respect to stock options outstanding at December 31, 2014:
|  | 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 |  |  | 950,512 |  |  |  | 4.41 |  |  |  | 880,721 |  |  | $ | 3.37 |
$3.80 – $5.35 |  |  | 898,399 |  |  |  | 5.01 |  |  |  | 874,189 |  |  | $ | 5.27 |
$5.41 – $5.41 |  |  | 985,758 |  |  |  | 7.90 |  |  |  | 436,290 |  |  | $ | 5.41 |
$5.42 – $5.42 |  |  | 50,000 |  |  |  | 5.24 |  |  |  | 50,000 |  |  | $ | 5.42 |
$5.70 – $5.70 |  |  | 804,771 |  |  |  | 5.94 |  |  |  | 804,771 |  |  | $ | 5.70 |
$5.94 – $11.03 |  |  | 809,679 |  |  |  | 5.12 |  |  |  | 713,466 |  |  | $ | 6.70 |
$11.35 – $11.88 |  |  | 59,250 |  |  |  | 2.38 |  |  |  | 38,750 |  |  | $ | 11.76 |
$12.12 – $12.12 |  |  | 942,287 |  |  |  | 8.95 |  |  |  | 234,592 |  |  | $ | 12.12 |
$12.23 – $13.99 |  |  | 750,324 |  |  |  | 4.66 |  |  |  | 548,824 |  |  | $ | 13.97 |
$14.07 – $23.02 |  |  | 1,755,400 |  |  |  | 8.67 |  |  |  | 348,329 |  |  | $ | 14.32 |
|  |  | 8,006,380 |  |  |  | 6.62 |  |  |  | 4,929,932 |  |  | $ | 7.21 |
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, 2013 |  |  | 1,063,657 |  |  |  |  |  |  |  |  |
RSUs awarded |  |  | 488,000 |  |  |  |  |  |  |  |  |
RSUs released |  |  | (616,756 | ) |  |  |  |  |  |  |  |
RSUs forfeited |  |  | (35,499 | ) |  |  |  |  |  |  |  |
RSUs outstanding at December 31, 2014 |  |  | 899,402 |  |  |  | 1.61 |  |  | $ | 13,680 |
RSUs vested and expected to vest at December 31, 2014 |  |  | 754,931 |  |  |  | 1.55 |  |  | $ | 11,482 |

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