STOCK-BASED COMPENSATION (Equity Based Compensation Schedule) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Allocation of stock-based compensation expense
Stock compensation expense	$ 2,659	$ 1,611
Research and development
Allocation of stock-based compensation expense
Stock compensation expense	980	754
Research and development | Employees
Allocation of stock-based compensation expense
Stock compensation expense	944	721
Research and development | Non-employees
Allocation of stock-based compensation expense
Stock compensation expense	36	33
General and administrative
Allocation of stock-based compensation expense
Stock compensation expense	1,679	857
General and administrative | Non-employees
Allocation of stock-based compensation expense
Stock compensation expense	307	184
General and administrative | Employees and directors
Allocation of stock-based compensation expense
Stock compensation expense	$ 1,372	$ 673