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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Tax benefits expired	$ 28.3
Unrecognized tax benefits that would impact effective tax rate	2.0
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards that will expire due to IRC Section 382 limitations	122.4
California [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards that will expire due to IRC Section 382 limitations	38.9
Pennsylvania [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards that will expire due to IRC Section 382 limitations	75.6
Research Tax Credit Carryforward [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward amount	2.0
Research Tax Credit Carryforward [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward amount	$ 2.1

X

- Definition

Operating Loss Carryforwards, Expiration in Period, Statute Limitations, Net

+ References

No definition available.

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- Definition

Tax Benefits Expired

+ References

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Carryforwards

-URI http://asc.fasb.org/extlink&oid=6506874

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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