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Inventories | 9 Months Ended
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Sep. 30, 2021
Inventory Disclosure [Abstract] |
Inventories |
4. | Inventories
Inventories as of December 31, 2020 and September 30, 2021 consisted of the following:
|  | December 31, |  |  | September 30, |
|  | 2020 |  |  | 2021 |
Raw materials |  | $ | 757,857 |  |  | $ | 2,820,938 |
Work in progress |  |  | 2,338,342 |  |  |  | 3,597,165 |
Finished goods |  |  | 2,156,646 |  |  |  | 2,831,352 |
|  | $ | 5,252,845 |  |  | $ | 9,249,455 |
During the three months ended September 30, 2020 and 2021, write-downs of inventories to lower of cost or net realizable value of $267,117 and $324,984, respectively, were charged to cost of revenues. During the nine months ended September 30, 2020 and 2021, write-downs of inventories to lower of cost or net realizable value of $724,156 and $663,041, respectively, were charged to cost of revenues.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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