STOCKHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2016

Stockholders' Equity Note [Abstract]

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

Certain employees, directors and consultants have been awarded restricted stock. The restricted stock vesting consists of milestone and time-based vesting. The following table summarizes restricted share activity for the three months ended March 31, 2016:

			Weighted
			Average
			Grant Date
	Number of Shares		Fair Value
Outstanding at December 31, 2015		7,359,915	$	7.83
Granted		14,000		9.43
Vested		(199,499)		8.37
Forfeited		—		—
Outstanding at March 31, 2016		7,174,416	$	7.81

Schedule Of Warrants Activity [Table Text Block]

The following table summarizes warrant activity for the three months ended March 31, 2016:

			Weighted-		Aggregate
			average		Intrinsic
	Warrants		exercise price		Value
Outstanding at December 31, 2015		1,186,749	$	2.37	$	11,341,452
Issued		—		—
Exercised		(9,612)		2.30
Expired		—		—
Outstanding at March 31, 2016		1,177,137	$	2.37	$	7,234,896

Schedule Of Share Based Compensation Expense [Table Text Block]

The following table summarizes stock-based compensation expense information about restricted stock for the three months ended March 31, 2016 and 2015, respectively:

	Three months ended		Three months ended
	March 31, 2016		March 31, 2015
Stock-based compensation expense associated with restricted stock	$	1,698,965	$	5,357,028
Stock-based compensation expense associated with option grants		—		—
	$	1,698,965	$	5,357,028