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Restructuring	12 Months Ended
Restructuring	Dec. 31, 2022
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring In 2022, we incurred $1.9 million in severance costs related to a reduction in headcount in our U.S. workforce. Restructuring expenses include salary and benefits for the impacted employees and are included in general and administrative expenses in the accompanying consolidated statements of operations. In 2020, we incurred $0.6 million in severance costs related to a reduction in headcount in our U.K. workforce. In 2020, we incurred $1.9 million in severance costs related to a reduction in headcount in our U.S. workforce in October, or U.S. restructuring. Restructuring expenses include salary and benefits for the impacted employees and are included in general and administrative expenses in the accompanying consolidated statements of operations. As part of the severance arrangement for our U.S. restructuring, certain separated employees were eligible to participate in a tender offer transaction and we repurchased 319,257 shares of common stock from employees who were existing stockholders and vested option holders for total consideration of approximately $3.1 million. The repurchased shares were constructively retired.