Income Taxes [Line Items]

No definition available.

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- Definition

Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYYformat.

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No definition available.

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- Definition

Expiration date of the tax credit carryforward, in CCYY format.

+ References

No definition available.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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- Definition

Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Income before taxes from U.S. operations	$ (103,100)	$ (92,700)	$ (74,000)
Income before taxes from foreign operations	$ 800	$ 1,000	$ 300
Statutory tax rate	21.00%	35.00%	35.00%
Net operating loss carryforwards	$ 212,400
Research and development credit carryforward	42,600
Deferred tax assets	277,730	$ 251,425
Valuation allowance	275,540	249,202
Total unrecognized tax benefit	20,447	18,786	$ 16,785	$ 18,735
Accrued interest or penalties	0	$ 0
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 832,000
Net operating loss carryforward, expiration	2024
Research and development credit carryforward	$ 33,700
Research and developmen tax credit carryforward, expiration	2024
State [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 566,600
Net operating loss carryforward, expiration	2018
Research and development credit carryforward	$ 34,400