SUMMARY OF CRITICAL ACCOUNTING POLICIES AND ESTIMATES - Summary of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash and cash equivalents	$ 2,303,725	$ 1,249,831	$ 1,740,345
Restricted cash	100,088	1,600,000	100,000
Cash and cash equivalents and restricted cash as shown in the consolidated statements of cash flows	$ 2,403,813	$ 2,849,831	$ 1,840,345	$ 1,105,787