DEBT - Borrowings Under Revolving Facility (Details) - Credit Agreement - Texas Capital Bank, National Association (TCB) - Revolving Credit Facility - USD ($)	Jul. 01, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Initial borrowing amount	$ 7,347,878	$ 6,368,068
Debt Instrument, Interest Rate, Effective Percentage for Initial Borrowing Amount	6.00%	5.50%
Second borrowing amount	$ 5,000,000	$ 5,000,000
Debt Instrument, Interest Rate, Effective Percentage for Second Borrowing Amount	4.75%	4.09%
Third borrowing amount	$ 5,000,000	$ 5,000,000
Debt Instrument, Interest Rate, Effective Percentage for Third Borrowing Amount	4.83%	4.13%
Fourth borrowing amount	$ 0	$ 5,000,000
Debt Instrument, Interest Rate, Effective Percentage for Fourth Borrowing Amount	0.00%	4.24%
Total borrowing amount	$ 17,347,878	$ 21,368,068