Summary of Significant Accounting Policies (Details 5) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Income Taxes
Valuation allowance related to deferred tax asset, primarily consisting of certain net operating loss and other tax carryforwards	$ 190,288,000	$ 177,353,000
Liability of accrued interest and penalties attributable to income taxes	$ 0

The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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