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Inventory
12 Months Ended
Dec. 31, 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 inventory, net of reserves (in thousands):
December 31, 2021
Work in process$3,929 
Finished goods459 
Total inventory, net$4,388 

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 December 31, 2021 is net of a reserve of $2.0 million for unsaleable inventory which is reflected in cost of product sales for the year ended December 31, 2021.

Inventory Reserves (in thousands)
Balance at Beginning of YearAdditions Charged to ExpensesDeductionsBalance at End of Year
Year Ended December 31, 2021
$— $(2,035)$— $(2,035)