CASH AND EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 51,677,130	$ 61,667,245
Unrealized Gains	0	0
Unrealized Losses	(222,220)	(291,844)
Fair Value	51,454,910	61,375,401
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year	30,831,190
One to five years	18,677,660
Greater than five years	1,946,060
Available-for-sale Securities	51,454,910
U.S. government and agency backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,365,672	36,343,817
Unrealized Gains	0	0
Unrealized Losses	(180,768)	(252,556)
Fair Value	36,184,904	36,091,261
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year	21,245,723
One to five years	12,993,121
Greater than five years	1,946,060
Available-for-sale Securities	36,184,904
Corporate debt and certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,311,458	25,323,428
Unrealized Gains	0	0
Unrealized Losses	(41,452)	(39,288)
Fair Value	15,270,006	$ 25,284,140
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Less than one year	9,585,467
One to five years	5,684,539
Greater than five years	0
Available-for-sale Securities	$ 15,270,006