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RESTRUCTURING AND RELATED ACTIVITIES (Tables)
9 Months Ended
Sep. 30, 2021
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Reserve by Type of Cost The following is a summary of accrued restructuring costs related to the Restructuring Plan:
September 30,
2021
(in thousands)
Severance and benefits costs$2,792 
Contract termination costs2,730
Other restructuring costs— 
Total restructuring costs$5,522 
Cash payments(856)
Balance at September 30, 2021$4,666