Income Taxes (Principal Components Of Deferred Taxes Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Depreciation and amortization	$ 72	$ 265
Accrued, allowance and others	3,166	3,085
Net operating losses	207,270	204,693
Tax credits	8,731	8,407
Unrealized losses on marketable securities		1,349
Total deferred tax assets	219,239	217,799
Less: valuation allowance	(219,239)	(217,799)
Net deferred tax assets