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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) customer | Dec. 31, 2017 USD ($) customer
Concentration risks |  |  |  |  |  |  |  |  |  |  |
Sales, net | $ 12,629,000 | $ 11,640,000 | $ 9,596,000 | $ 7,932,000 | $ 8,264,000 | $ 9,863,000 | $ 7,475,000 | $ 7,673,000 | $ 41,797,179 | $ 33,274,702 | $ 34,493,838
Allowance for doubtful accounts |  |  |  |  |  |  |  |  | $ (3,000) |  |
Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Concentration risks |  |  |  |  |  |  |  |  |  |  |
Number of significant customers | customer |  |  |  |  |  |  |  |  | 3 | 2 | 2
Sales, net |  |  |  |  |  |  |  |  | $ 19,000,000 | $ 13,100,000 | $ 14,000,000
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 45.60% | 39.20% | 40.50%
Supplier Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Concentration risks |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 82.60% | 85.30% | 82.90%

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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