STOCKHOLDERS' EQUITY (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Preferred stock, shares authorized	10,000,000	10,000,000	10,000,000
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Net Proceeds From Shares New Issues Over-Allotments	$ 113,639	$ 131,516	$ 4,411
Common Stock, Shares Authorized	150,000,000	150,000,000	150,000,000
Share-based Compensation, Total	$ 12,900	$ 15,900	$ 7,500
Treasury Stock, Shares	41,309	41,309	41,309
Treasury Stock, Value	$ 234	$ 234	$ 234
Atm [Member]
Stock Issued During Period, Shares, New Issues	9,025,222	3,104,253	570,366
Share Price	$ 12.83	$ 10.18	$ 7.88
Gross proceeds		$ 31,600	$ 4,400
Net proceeds		$ 31,000	$ 4,500