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Commitments and Contingencies (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Commitments and Contingencies (Additional Textual) [Abstract] |  |  |  |  |  |
Net book value of assets held under capital leases | $ 0 |  |  | $ 0 | $ 52,000 |
Accumulated amortization cost | 510,000 |  |  | 510,000 | 458,000 |
Outstanding borrowings under the credit facility | 0 |  |  | 0 |  |
Amount borrowed against the facility | 9,000,000 | 5,000,000 | 12,000,000 |  |  |
Present value of the net minimum lease payments | 0 |  |  | 0 |  |
Rental expense under operating leases |  |  |  | 4,500,000 | 4,700,000 | 3,500,000
Purchase commitments |  |  |  | 103,300,000 |  |
Estimate of potential settlements on legal and indemnification matters | 645,000 |  |  | 645,000 |  |
Borrowings under the facility interest rate | 1.00% |  |  | 1.00% |  |
Cash equivalents and marketable securities held at bank | 20,100,000 |  |  | 20,100,000 |  |
Company's borrowing limit under credit facility | $ 16,800,000 |  |  | $ 16,800,000 |  |
September Fifteenth Two Thousand Eight [Member] |  |  |  |  |  |
Commitments and Contingencies (Textual) [Abstract] |  |  |  |  |  |
"Lawsuit" filed date |  |  |  | September 15, 2008 |  |
September Eighteenth Two Thousand Eight [Member] |  |  |  |  |  |
Commitments and Contingencies (Textual) [Abstract] |  |  |  |  |  |
"Lawsuit" filed date |  |  |  | September 18, 2008 |  |

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- Definition Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph a(ii) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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