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Commitments and Contingencies (Details) (USD $)			9 Months Ended
	Nov. 01, 2012	Sep. 30, 2012	Sep. 30, 2012 September Fifteenth Two Thousand Eight [Member]	Sep. 30, 2012 September Eighteenth Two Thousand Eight [Member]	Sep. 30, 2012 Insurance proceeds [Member]	Dec. 31, 2011 Company [Member]
Commitments and Contingencies (Textual) [Abstract]
"Lawsuit" filed date			September 15, 2008	September 18, 2008
Payment of fees and expenses to the plaintiffs' counsel		$ 900,000			$ 500,000	$ 400,000
Commitments and Contingencies (Additional Textual) [Abstract]
Company borrowed against the facility	9,000,000	5,000,000
Borrowings under the facility interest rate		1.00%
Cash equivalents and marketable securities held at bank		25,200,000
Borrowing limit under the credit facility		$ 14,100,000

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Cash equivalents and marketable securities held at bank.

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- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Name Accounting Standards Codification

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States the date the complaint was formally filed in a court of law, in arbitration or mediation.

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Amount of consideration the entity has agreed to pay to settle a legal matter.

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