DERIVATIVE INSTRUMENTS, CHANGES IN DERIVATIVE WARRANT LIABILITY (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Changes in Derivative Warrant Liability
Balance at beginning of year	$ 4
Issuance of new warrants	13,172
Reduction in derivative liability due to exercise of warrants	(10,620)
Reclassification of fair value of derivative liabilities to equity on amendment of warrant agreements	14,707
Reduction in derivative liability due to warrant exchange	(14)
Repurchase of warrants	(14)
Increase in the fair value of warrants	12,165
Balance at end of period	$ 0