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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	3 Months Ended								12 Months Ended
	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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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