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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 30, 2024
Apr. 08, 2024
Mar. 26, 2024
Mar. 21, 2024
Dec. 31, 2022
May 31, 2021
Aug. 31, 2020
Dec. 31, 2024
Dec. 31, 2023
May 31, 2024
Jun. 30, 2023
May 31, 2022
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Preferred stock, shares authorized (in shares)               5,000,000 5,000,000        
Preferred stock, shares issued (in shares)               0 0        
Preferred stock, shares outstanding (in shares)               0 0        
Common stock, shares authorized (in shares) 960,000,000             960,000,000 960,000,000 640,000,000 640,000,000   320,000,000
Beginning balance (in shares)               212,837,679 178,133,548        
Common stock, par value (in dollars per share)     $ 0.01         $ 0.01 $ 0.01        
Shares reserved for issuance of future awards (in shares)               2,110,961          
Stock option maximum term               5 years 3 months 10 days          
Specified stockholder ownership percentage 10.00%                        
Purchase price of common stock percent under stock incentive plans for specified stockholder 110.00%                        
Stock option maximum term for specified stockholder 5 years                        
Share of common stock subject to a stock option or stock appreciation right (in shares) 100.00%                     100.00%  
Intrinsic value of options exercised               $ 0 $ 0        
Restricted stock units awarded (in shares)               11,783,300          
Total payments for the employees' tax obligations to taxing authorities               $ 904,000 $ 1,453,000        
Common Stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Beginning balance (in shares)         166,793,320     212,837,679 178,133,548        
Issuance of common stock in at-the-market offering, net of offering expenses (in shares)                 8,249,261        
Issuance of common stock upon exercise of pre-funded warrants (in shares)   3,809,523           3,809,523          
Pre Funded Common Stock Warrant                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Offering price of each common stock (in dollars per share)   $ 0.01                      
Restricted Stock Units (RSUs)                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Restricted stock units awarded (in shares)               11,783,300 4,811,834        
Grant date fair value per award of restricted stock units (in dollars per share)               $ 0.47 $ 2.29        
Aggregate fair value of RSUs vested in period               $ 10,500,000 $ 17,800,000        
Shares withheld from issuance in order to pay employee taxes (in shares)               861,509 788,236        
Restated 2018 Stock Incentive Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Increase in capital shares reserved for future issuance (in shares) 11,000,000                   10,000,000    
Shares reserved for issuance of future awards (in shares)               38,800,000          
2018 Stock Incentive Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares reserved for issuance of future awards (in shares)               18,826,554          
Percent of fair value per share of common stock on option grant date 100.00%                        
Stock options expiration term 10 years                        
Fixed ratio shares of common stock 1.33                        
2010 Employee Stock Purchase Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Percent of fair value per share of common stock on option grant date           85.00%              
Stock reserved for issuance under plan (in shares)           5,000,000              
Purchase plan offering period           2 years              
Purchase plan purchase period           6 months              
Maximum | Restricted Stock Units (RSUs)                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock options vesting period               3 years          
Maximum | 2018 Stock Incentive Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock option maximum term 10 years                        
Stock options vesting period 4 years                        
Minimum | Restricted Stock Units (RSUs)                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock options vesting period               2 years          
Minimum | 2018 Stock Incentive Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock options vesting period 3 years                        
Private Placement                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Consideration received from sale of stock       $ 21,900,000                  
Sale of stock, number of shares issued in transaction (in shares)     24,761,905                    
Cash placement fees       6.00%                  
Net of placement fees       $ 1,400,000                  
Proceeds from other offering expenses       $ 700,000                  
Private Placement | Pre Funded Common Stock Warrant                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Sale of stock, number of shares issued in transaction (in shares)     28,571,428                    
Sale of stock, number of shares issued in transaction, per unit (in shares)     1                    
Number of shares of common stock for each Common warrant (in shares)     1                    
Sale of stock, price per share (in dollars per share)     $ 0.83                    
Sangamo stock price (USD) (in dollars per share)     0.01                    
Offering price of each common stock (in dollars per share)     $ 1.00                    
Private Placement | Common Warrant                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Sale of stock, number of shares issued in transaction, per unit (in shares)     1                    
Number of shares of common stock for each Common warrant (in shares)     1                    
Sale of stock, price per share (in dollars per share)     $ 0.84                    
Warrant or right outstanding, exercisable, period after issuance       6 months                  
Term of warrants     5 years 6 months                    
Private Placement | Pre Funded Common Stock Warrant                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of new stock issued during the period (in shares)     3,809,523                    
Jefferies LLC | ATM Agreement                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock offering program, maximum value             $ 150,000,000            
Stock offering program, increase to aggregate offering price         $ 175,000,000                
Amount remained available               $ 186,900,000          
Issuance of common stock in at-the-market offering, net of offering expenses (in shares)               3,638,740 8,249,261        
Consideration received from sale of stock               $ 7,100,000 $ 15,100,000