SUMMARY OF CRITICAL ACCOUNTING POLICIES AND ESTIMATES - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Cash	$ 1,718,830	$ 1,105,787	$ 458,374
Restricted cash	0		1,508,447
Cash, cash equivalents and restricted cash as shown in the consolidated statements of cash flows	$ 1,718,830	$ 1,105,787	$ 1,966,821	$ 3,206,158