SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES (Details - ASC 606) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid and other current assets	$ 15,516	$ 16,428	$ 13,784
Deferred income tax assets	87,664	79,289	19,626
Accumulated deficit	$ (592,654)	(610,482)	$ (706,981)
Balances without adoption of ASC Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid and other current assets		11,881
Deferred income tax assets		20,156
Accumulated deficit		(708,354)
Adjustments due to ASC Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid and other current assets		1,903
Deferred income tax assets		(530)
Accumulated deficit		$ 1,373