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Commitments and Contingencies
 9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies Commitments and Contingencies
 
The Company's purchase commitments consist of minimum purchase amounts of materials used in the Company's cell manufacturing process to manufacture its marketed cell therapy products. In addition, the Company also pays for usage of an offsite warehouse space. In February 2021, the terms of the warehouse operating agreement were extended through March 31, 2027. The Company records rent expense related to this agreement on a straight-line basis over the remaining term.

Future minimum payments related to the Company's contractual obligations are as follows:
  Payments Due by Period
Contractual Obligations (in thousands)TotalOctober 1, 2021 - December 31, 20212022202320242025More than 5 Years
Purchase commitments$8,782 $3,011 $5,771 $— $— $— $— 
Warehouse operating agreement4,930 263 1,046 1,046 792 792 991 
Total$13,712 $3,274 $6,817 $1,046 $792 $792 $991