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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2018 | 8,726,092 |  |  | $ | 11.23 |  |  |  |  |
Options granted | 4,530,288 |  |  | $ | 9.68 |  |  |  |  |
Options exercised | (806,226) |  |  | $ | 5.08 |  |  |  |  |
Options canceled | (2,620,867) |  |  | $ | 12.39 |  |  |  |  |
Options outstanding at December 31, 2019 | 9,829,287 |  |  | $ | 10.71 |  |  | 7.91 |  | $ | 7,472 |
Options vested and expected to vest at December 31, 2019 | 9,829,287 |  |  | $ | 10.71 |  |  | 7.91 |  | $ | 7,472 |
Options exercisable at December 31, 2019 | 3,993,645 |  |  | $ | 10.43 |  |  | 6.54 |  | $ | 5,442 |
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, 2018 | 322,701 |  |  |  |  |
RSUs awarded | 834,745 |  |  |  |  |
RSUs released | (118,807) |  |  |  |  |
RSUs forfeited | (175,789) |  |  |  |  |
RSUs outstanding at December 31, 2019 | 862,850 |  |  | 1.22 |  | $ | 7,222 |
RSUs vested and expected to vest at December 31, 2019 | 862,850 |  |  | 1.22 |  | $ | 7,222 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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