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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) item
Concentration risks |  |  |
Number of significant customers | item | 2 | 2 | 1
Aggregate dollar amount of net sales to significant customers | $ 33,274,702 | $ 34,493,838 | $ 29,826,636
Customer Concentration Risk |  |  |
Concentration risks |  |  |
Decrease in allowance for doubtful accounts |  | 48,000,000 |
Sales | Customer Concentration Risk |  |  |
Concentration risks |  |  |
Aggregate dollar amount of net sales to significant customers | $ 13,100,000 | $ 14,000,000 | $ 9,400,000
Percentage of net sales to significant customers (as a percent) | 39.20% | 40.50% | 31.40%
Cost of Goods, Product Line | Supplier Concentration Risk |  |  |
Concentration risks |  |  |
Percentage of net sales to significant customers (as a percent) | 85.30% | 82.90% | 78.40%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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