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INVENTORIES | 12 Months Ended
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Dec. 31, 2018
Inventory Disclosure [Abstract] |
INVENTORIES | 6. INVENTORIES Inventories consist of the following:
|  | December 31, |
|  | 2017 |  |  | 2018 |
Raw materials |  | $ | 3,944,796 |  |  | $ | 3,821,620 |
Work-in-process |  |  | 6,536,395 |  |  |  | 5,711,848 |
Finished goods |  |  | 5,202,299 |  |  |  | 5,915,899 |
Total |  | $ | 15,683,490 |  |  | $ | 15,449,367 |
Inventory write-down was nil for the years ended December 31, 2016, 2017 and 2018.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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