SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Accounts receivable, net of allowance for doubtful accounts	$ 182,757	$ 182,488
Largest Customer \| Accounts Receivable \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	11.70%	18.80%

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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