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Inventories | 3 Months Ended
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Mar. 31, 2021
Inventory Disclosure [Abstract] |
Inventories |
| 4. | Inventories
Inventories as of December 31, 2020 and March 31, 2021 consisted of the following:
|  | December 31, |  |  | March 31, |
|  | 2020 |  |  | 2021 |
Raw materials |  | $ | 757,857 |  |  | $ | 1,042,448 |
Work in progress |  |  | 2,338,342 |  |  |  | 1,911,177 |
Finished goods |  |  | 2,156,646 |  |  |  | 3,545,688 |
|  | $ | 5,252,845 |  |  | $ | 6,499,313 |
During the three months ended March 31, 2020 and 2021, write-downs of obsolete inventories to lower of cost or market of $409,062 and $233,305, 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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