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Inventories, Net | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Dec. 31, 2021
Inventory Disclosure [Abstract] |  |
INVENTORIES, NET | NOTE 4. INVENTORIES, NET Inventories consisted of the following:
|  | December 31, 2021 |  | March 31, 2022
Work in process |  | $ | 20,760 |  | $ | 23,124
Raw materials |  |  | 25,266 |  |  | 26,128
Finished goods |  |  | 7,398 |  |  | 8,829
Total |  | $ | 53,424 |  | $ | 58,081
Provision for obsolete inventories at $218 and $471 were recognized for the three months ended March 31, 2021 and 2022, respectively. | 5. INVENTORIES, NET Inventories consisted of the following:
|  | December 31, 2020 |  | December 31, 2021
Work in process |  | $ | 22,167 |  | $ | 20,760
Raw materials |  |  | 17,451 |  |  | 25,266
Finished goods |  |  | 5,350 |  |  | 7,398
Total |  | $ | 44,968 |  | $ | 53,424
Provision for obsolete inventory at $4,233, $1,343 and $18,295 were recognized for the years ended December 31, 2019, 2020 and 2021, respectively, primarily related to the obsolete inventory as a result of technology development or product upgrade.

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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 https://asc.fasb.org/topic&trid=2126998 + Details
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