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Inventory, Net
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventory, Net Inventory, Net
All of the Company's inventory relates to the manufacturing of MARGENZA. The following table sets forth the Company's net inventory (in thousands):
September 30, 2021
Raw materials$608 
Work in process3,095 
Finished goods276 
Total inventory, net$3,979 
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. The inventory balance as of September 30, 2021, is net of a reserve of $1.6 million for unsaleable inventory which is reflected in cost of product sales for the three and nine months ended September 30, 2021.