MARKETABLE SECURITIES - Narrative (Details) - USD ($)		3 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017
Marketable Securities [Abstract]
Contractual maturity of current available-for-sale securities		1 year
Available-for-sale securities in an unrealized loss position		$ 0
Cost basis of equity securities		300,000
Unrealized gain on equity securities	$ 300,000
Gross realized gains		0	$ 0
Gross realized losses		$ 0	$ 0