INCOME TAXES (Details-Income tax provision) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at statutory rate	$ 2,120	$ (1,829)
State taxes	(61)	(37)
Effect of change in future tax rate on deferred tax balances	0	2,226
Stock-based compensation	(2,680)	685
Change in derivative liability	0	(85)
Non-deductible interest on convertible notes	11	135
Royalty buyout	0	827
Other permanent differences	117	90
Change in valuation allowance	586	(2,494)
Income tax expense (benefit)	$ 93	$ (482)
Income tax expense (benefit) at statutory rate (percent)	21.00%	34.00%
State taxes (percent)	(0.60%)	0.70%
Effect of change in future tax rate on deferred tax balances (percent)	0.00%	(41.40%)
Stock-based compensation (percent)	(26.60%)	(12.70%)
Change in derivative liability (percent)	0.00%	1.60%
Non-deductible interest on convertible notes (percent)	0.10%	(2.50%)
Royalty buyout (percent)	0.00%	(15.40%)
Other permanent differences (percent)	1.20%	(1.70%)
Change in valuation allowance (percent)	5.80%	46.40%
Income tax expense (benefit) (percent)	0.90%	9.00%