NOTE E — INVENTORY

Following are the major classes of inventory as of the below dates (in thousands):

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The Company did not record inventory reserve for the three months ended September 30, 2021 and 2020, respectively, and recorded an inventory reserve of $4.8 million and $12.9 million for the nine months ended September 30, 2021 and 2020, respectively. These amounts are included in cost of products in the accompanying condensed consolidated statements of operations, due to the Company’s evaluation of the inventory’s net realizable value.

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The Company recorded inventory scrap loss reserves of $0.1 million and $0.1 million for the three months ended September 30, 2021 and 2020, respectively. The Company recorded inventory scrap loss reserves of $0.2 million and $0.5 million for the nine months ended September 30, 2021 and 2020, respectively, each of which was included in cost of products in the accompanying condensed consolidated statements of operations.