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Inventories, Net | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Inventory Disclosure [Abstract] |  |
INVENTORIES, NET | 5. INVENTORIES, NET Inventories consisted of the following:
|  | December 31, 2020 |  | September 30, 2021
Work in process |  | $ | 22,167 |  | $ | 18,222
Raw materials |  |  | 17,451 |  |  | 20,725
Finished goods |  |  | 5,350 |  |  | 8,873
Total |  | $ | 44,968 |  | $ | 47,820
Provision for obsolete inventories at $680 and $6,569 were recognized for the three months ended September 30, 2020 and 2021, respectively. Provision for obsolete inventory at $1,326 and $12,667 were recognized for the nine months ended September 30, 2020 and 2021, respectively. | 4. INVENTORIES, NET Inventories consisted of the following:
|  | December 31, 2019 |  | December 31, 2020
Work in process |  | $ | 27,854 |  | $ | 22,167
Raw materials |  |  | 17,201 |  |  | 17,451
Finished goods |  |  | 12,249 |  |  | 5,350
Total |  | $ | 57,304 |  | $ | 44,968
Provision for obsolete inventory at $13,622, $4,233 and $1,343 were recognized for the years ended December 31, 2018, 2019 and 2020, respectively.

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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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