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Related Party Disclosures
12 Months Ended
Dec. 31, 2019
Related Party Transactions [Abstract]  
Related Party Transaction RELATED PARTY TRANSACTIONDuring the year, the Company acquired 52,700 vested free shares from a former executive of Sangamo France who is now an executive of Sangamo, pursuant to the exercise of the Free Shares Options for approximately $0.1 million of cash.