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Commitments and Contingencies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 sqft | Dec. 31, 2011 | Dec. 31, 2010
Leases [Abstract] |  |  |
Area of property under long-term operating lease (in square feet) | 27,760 |  |
Period of operating lease | 7 years |  |
Period to be lapsed for cancelling lease | 5 years |  |
Percentage of annual rent to be paid for cancelling lease (in hundredths) | 50.00% |  |
Rent expenses under the operating leases | $ 447,000 | $ 460,000 | $ 308,000
Summary of total minimum lease payments [Abstract] |  |  |
2013 | 396,000 |  |
2014 | 322,000 |  |
2015 | 295,000 |  |
2016 | 1,000 |  |
Total | 1,014,000 |  |
Royalty Agreement [Abstract] |  |  |
Term of royalty agreement | 8 years |  |
Aggregate amount payable towards royalty | 7,000,000 |  |
Royalty expense | 1,400,000 | 1,300,000 |
Summary of total royalty payments under the agreement[Abstract] |  |  |
2013 | 800,000 |  |
2014 | 800,000 |  |
2015 | 800,000 |  |
2016 | 575,000 |  |
2017 | 575,000 |  |
Thereafter | 575,000 |  |
Total royalty payments | $ 4,125,000 |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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