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RESTRICTED NET ASSETS OR PARENT COMPANY'S CONDENSED FINANCIAL STATEMENTS - Additional Information (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 04, 2019 | Dec. 26, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Restricted net assets |  |  | $ 5,967,000 | $ 4,969,000 |
Direct offering costs |  |  | $ 26,399 | $ 2,103,816 | $ 0
IPO |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Number of shares sold | 19,361 | 1,241,459 |  |  |
Selling price | $ 5 | $ 5 |  |  |
Gross proceeds | $ 96,805 | $ 6,207,295 |  |  |
Direct offering costs | $ 26,399 | $ 2,103,816 |  |  |

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor. + References No definition available. + Details
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