XML 43 R31.htm IDEA: XBRL DOCUMENT
v3.21.2

CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | $ 169,878 | $ 131,329 | $ 467,443 | $ 80,428
Available-for-sale securities, Amortized Cost | 408,922 | 560,575 |  |
Available-for-sale securities, Gross Unrealized Gains | 84 | 86 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (26) | (37) |  |
Available-for-sale securities, Estimated Fair Value | 408,980 | 560,624 |  |
Total cash equivalents and available-for-sale securities, Amortized Cost | 466,293 | 613,740 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains | 84 | 86 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses) | (26) | (37) |  |
Total cash equivalents and available-for-sale securities, Estimated Fair Value | 466,351 | 613,789 |  |
Money market funds |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 57,371 | 53,165 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 0 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 57,371 | 53,165 |  |
Cash equivalents |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 57,371 | 53,165 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 0 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 57,371 | 53,165 |  |
U.S. government-sponsored entity debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 160,310 | 257,284 |  |
Available-for-sale securities, Gross Unrealized Gains | 26 | 19 |  |
Available-for-sale securities, Gross Unrealized (Losses) | 0 | (5) |  |
Available-for-sale securities, Estimated Fair Value | 160,336 | 257,298 |  |
Commercial paper securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 143,435 | 213,500 |  |
Available-for-sale securities, Gross Unrealized Gains | 33 | 41 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (3) | (8) |  |
Available-for-sale securities, Estimated Fair Value | 143,465 | 213,533 |  |
Corporate debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 36,942 | 59,575 |  |
Available-for-sale securities, Gross Unrealized Gains | 6 | 16 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (10) | (17) |  |
Available-for-sale securities, Estimated Fair Value | 36,938 | 59,574 |  |
Asset-backed securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 45,743 | 17,905 |  |
Available-for-sale securities, Gross Unrealized Gains | 12 | 10 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (13) | (7) |  |
Available-for-sale securities, Estimated Fair Value | 45,742 | 17,908 |  |
Certificates of deposit |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 22,492 | 12,311 |  |
Available-for-sale securities, Gross Unrealized Gains | 7 | 0 |  |
Available-for-sale securities, Gross Unrealized (Losses) | 0 | 0 |  |
Available-for-sale securities, Estimated Fair Value | $ 22,499 | $ 12,311 |  |

X
- Definition Cash equivalents and available for sale securities. + References No definition available. + Details
Name: | sgmo_CashEquivalentsAndAvailableForSaleSecurities
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash equivalents and available for Sale Securities Amortized Cost + References No definition available. + Details
Name: | sgmo_CashEquivalentsAndAvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash equivalents and available for sale securities, gross unrealized gain, before tax. + References No definition available. + Details
Name: | sgmo_CashEquivalentsAndAvailableForSaleSecuritiesGrossUnrealizedGainBeforeTax
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash equivalents and available for sale securities, gross unrealized loss, before Tax + References No definition available. + Details
Name: | sgmo_CashEquivalentsAndAvailableForSaleSecuritiesGrossUnrealizedLossBeforeTax
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash Equivalents Gross Unrealized Gain Before Tax + References No definition available. + Details
Name: | sgmo_CashEquivalentsGrossUnrealizedGainBeforeTax
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash Equivalents, Gross Unrealized Loss, Before Tax + References No definition available. + Details
Name: | sgmo_CashEquivalentsGrossUnrealizedLossBeforeTax
Namespace Prefix: | sgmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |