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Inventory
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventory Inventory
All of the Company's inventory relates to the manufacturing of MARGENZA. The following table sets forth the Company's inventory as of March 31, 2021 (in thousands):

Raw materials$1,215 
Work in process4,957 
Total inventory$6,172 
Prior to FDA approval of MARGENZA in December 2020, the cost of materials and expenses associated with the manufacturing of MARGENZA were recorded as research and development expense. Subsequent to FDA approval, the Company began capitalizing inventory costs related to the manufacture of MARGENZA.