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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) customer | Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) customer
Concentration risks |  |  |
Aggregate dollar amount of net sales to significant customers | $ 81,862,453 | $ 41,797,179 | $ 33,274,702
Allowance for doubtful accounts | $ (125,000) |  |
Customer Concentration Risk |  |  |
Concentration risks |  |  |
Number of significant customers | customer | 2 | 3 | 2
Aggregate dollar amount of net sales to significant customers | $ 41,600,000 | $ 19,000,000 | $ 13,100,000
Percentage of net sales to significant customers | 50.60% | 45.60% | 39.20%
Supplier Concentration Risk |  |  |
Concentration risks |  |  |
Percentage of net sales to significant customers | 85.20% | 82.60% | 85.30%
Department of health and human |  |  |
Concentration risks |  |  |
Aggregate dollar amount of net sales to significant customers | $ 31,600,000 |  |
Contract receivables | $ 83,800,000 |  |

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- Definition Amount of increase (decrease) in allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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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=118260190&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=118260190&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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