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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) customer | Mar. 31, 2022 | Jun. 30, 2021 USD ($) customer | Mar. 31, 2021 | Jun. 30, 2022 USD ($) customer | Jun. 30, 2021 USD ($) customer
Concentration risks |  |  |  |  |  |
Aggregate dollar amount of net sales to significant customers | $ 14,336,569 |  | $ 42,496,944 |  | $ 59,078,919 | $ 92,570,669
Customer Concentration Risk | Revenue | Significant customers |  |  |  |  |  |
Concentration risks |  |  |  |  |  |
Number of significant customers | customer | 3 |  | 1 |  | 4 | 1
Aggregate dollar amount of net sales to significant customers | $ 8,300,000 |  | $ 27,400,000 |  | $ 44,400,000 | $ 65,100,000
Percentage of net sales to significant customers | 57.60% |  | 64.40% |  | 75.20% | 70.40%
Supplier Concentration Risk | Revenue | China |  |  |  |  |  |
Concentration risks |  |  |  |  |  |
Concentration risk, geographic |  | 83.5% |  | 90.6% | 91.2% | 90.4%

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- Definition Description of risks that arise due to concentrations of operating facilities, revenues, assets, customers, vendors or the like in a certain geographic area, either domestic or foreign. The description may address risks inherent in the geographic area, and, at a minimum, informs users of the general nature of the risk, but excludes "Information about Geographic Areas" that may be disclosed elsewhere (for instance, segment disclosures).. + 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 -Subparagraph (d) -URI https://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 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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