Income Taxes (Details - Rate Table)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	0.50%	0.40%	0.50%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses	0.30%	2.20%	6.60%
effective income tax reconciliation, compensation-related	(1.00%)	(2.50%)	6.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	(21.00%)	(35.00%)	(35.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	0.40%	(1.00%)	(2.10%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential	(8.30%)	(38.90%)	(142.10%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense	2.10%	1.70%	(11.30%)
Effective Income Tax Rate Reconciliation, Tax Credits, Research	(2.60%)	(2.60%)	(15.50%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance	(5.20%)	(4.10%)	(42.20%)
Effective Income Tax Rate Reconciliation, Uncertain Domestic Tax Positions	(22.00%)	10.70%	49.50%
Effective Income Tax Rate Reconciliation, TCJA net impact	(4.70%)	91.40%	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments	1.80%	(0.20%)	(3.50%)
Reported tax rate	(17.50%)	88.80%	(95.90%)