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INCOME TAXES
 6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
INCOME TAXES INCOME TAXESThe Company’s provision for income taxes for interim periods is determined using an estimate of its annual effective tax rate, adjusted for discrete items, if any, that arise during the period. Each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual effective tax rate changes, the Company makes a cumulative adjustment in such period. In the six months ended June 30, 2021, the Company recorded income tax expense of $0.3 million, and no such expense was recorded in the six months ended June 30, 2020. The Company continues to maintain a full valuation allowance on its U.S. federal and state net deferred tax assets and on the Sangamo France net deferred tax assets, as the Company believes it is not more likely than not that these benefits will be realized. The tax expense for the three and six months ended June 30, 2021 was due to foreign income tax expense.