CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Operating Activities:
Net (loss) income	$ (49,089)	$ 21,133
Adjustments to reconcile net loss to net cash used in operating activities:
Impairment of long-lived assets	4,349	20,433
Depreciation and amortization	1,406	3,489
Accretion of discount on marketable securities	(273)	(1,048)
Amortization in operating lease right-of-use assets	1,120	2,092
Stock-based compensation	2,719	8,277
Impairment of goodwill	0	38,138
Net changes in operating assets and liabilities:
Interest receivable	354	(229)
Accounts receivable	232	(3,348)
Prepaid expenses and other assets	(783)	6,223
Accounts payable and other accrued liabilities	(4,939)	(1,905)
Accrued compensation and employee benefits	(2,559)	(8,599)
Lease liabilities	(1,218)	(1,212)
Other non-current liabilities	18	22
Deferred revenues	0	(149,766)
Net cash used in operating activities	(48,663)	(66,300)
Investing Activities:
Purchases of marketable securities	0	(36,225)
Maturities of marketable securities	1,110	82,153
Sales of marketable securities	34,730	0
Purchases of property and equipment	0	(10,200)
Net cash provided by investing activities	35,840	35,728
Financing Activities:
Taxes paid related to net share settlement of equity awards	(402)	(1,109)
Net cash provided by financing activities	22,122	8,002
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(670)	367
Net increase (decrease) in cash, cash equivalents, and restricted cash	8,629	(22,203)
Cash, cash equivalents, and restricted cash, beginning of period	46,704	101,944
Cash, cash equivalents, and restricted cash, end of period	55,333	79,741
Supplemental cash flow disclosures:
Offering expenses in relation to issuance of common stock included in unpaid liabilities	736	0
Property and equipment included in unpaid liabilities	460	5,184
Direct offering
Financing Activities:
Proceeds from issuance of common stock, net of offering expenses	22,524	0
At the Market Offering
Financing Activities:
Proceeds from issuance of common stock, net of offering expenses	$ 0	$ 9,111

Stock Issuance Costs, Not Yet Paid

No definition available.

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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.