Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation between the provision for income taxes and income taxes
Computed "expected" tax benefit	$ (7,712)	$ (2,606)	$ (10,331)
State income taxes, net of federal benefit	451	(545)	(2,117)
Tax effect of:
Change in valuation allowance	(37,179)	2,185	12,987
Expiration of prior year credits and net operating losses	45,382	1,880	1,838
Research and development and other tax credits carryovers	(1,097)	(1,468)	(2,519)
Stock compensation	358	297	294
Other	(203)	257	(152)
Provision for income taxes

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the year/accounting period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to all other items not otherwise listed in the existing taxonomy.

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The sum of the differences between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to tax credits.

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Income tax reconciliation expiration of prior year credits and net operating losses.

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