CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Net loss	$ (93,373)	$ (87,150)
Adjustments to reconcile net loss to net cash used in operating activities:
Impairment of goodwill and indefinite-lived intangible assets	89,485	0
Impairment of long-lived assets	20,433	0
Depreciation and amortization	7,745	5,716
(Accretion of discounts) amortization of premium on marketable securities	(1,865)	207
Amortization and other changes in operating lease right-of-use assets	4,018	4,225
Deferred income tax benefit	(6,377)	0
Stock-based compensation	15,067	15,609
Net changes in operating assets and liabilities:
Interest receivable	(425)	60
Accounts receivable	962	11
Prepaid expenses and other assets	5,548	(4,992)
Accounts payable and other accrued liabilities	(3,101)	5,796
Accrued compensation and employee benefits	(8,450)	(6,618)
Deferred revenues	(154,284)	(43,772)
Lease liabilities	(2,455)	(2,121)
Other non-current liabilities	61	69
Net cash used in operating activities	(127,011)	(112,960)
Investing Activities:
Purchases of marketable securities	(52,112)	(129,928)
Maturities of marketable securities	146,048	168,346
Purchases of property and equipment	(15,740)	(8,284)
Net cash provided by investing activities	78,196	30,134
Financing Activities:
Taxes paid related to net share settlement of equity awards	(1,303)	(1,827)
Proceeds from exercise of stock options	0	90
Net cash provided by financing activities	14,521	21,307
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	680	352
Net decrease in cash, cash equivalents, and restricted cash	(33,614)	(61,167)
Cash, cash equivalents, and restricted cash, beginning of period	101,944	180,372
Cash, cash equivalents, and restricted cash, end of period	68,330	119,205
Supplemental cash flow disclosures:
Property and equipment included in unpaid liabilities	4,909	2,232
At the Market Offering
Financing Activities:
Proceeds from at-the market offering/ issuance of common stock	15,105	21,929
Employee Stock
Financing Activities:
Proceeds from at-the market offering/ issuance of common stock	$ 719	$ 1,115

Amortization And Other Changes In Right-of-Use Assets

No definition available.

Name:	sgmo_AmortizationAndOtherChangesInRightOfUseAssets
Namespace Prefix:	sgmo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.