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Income Taxes (Details Textual) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Business Acquisition [Line Items] |  |  |
U.S - based valuation allowance | $ 63,881,000 | $ 36,395,000 |
Federal net operating loss carryforwards expire | 2026 through 2032 |  |
Income Taxes (Textual) [Abstract] |  |  |
Valuation allowance related to its U.S based deferred taxes | 27,500,000 | 14,600,000 | 3,100,000
Research and Development Tax Credits | 614,000 |  |
Valuation allowance prior to 2010 | 14,800,000 |  |
Deferred income tax expense related to the changes in the valuation allowances on deferred tax assets | 508,000 | 1,199,000 | 11,441,000
Statutory federal income tax rate | 34.00% | 34.00% | 34.00%
Uncertain income tax position unrecognized | Less than a 50% likelihood |  |
Settlements and lapses in statutes of limitations | (50,000) | (9,490,000) | 0
Associated interest due to expiration of the applicable statutes of limitations for certain tax years | 5,000 | 2,300,000 |
Total liability for unrecognized tax benefits included other long-term liabilities | 400,000 | 400,000 |
Recognized tax benefits that would affect the effective tax rate | 100,000 |  |
Interest and penalties related to unrecognized tax benefits in the provision for income taxes | 200,000 | 200,000 |
Expected unrecognized tax benefits due to expiration of limitations applicable to the 2008 taxable year | 71,000 |  |
State and Local Jurisdiction [Member] |  |  |
Business Acquisition [Line Items] |  |  |
U.S. federal net operating loss carryforwards | 91,200,000 |  |
Foreign Country [Member] |  |  |
Business Acquisition [Line Items] |  |  |
U.S - based valuation allowance | 5,000,000 | 4,300,000 |
U.S. federal net operating loss carryforwards | 26,400,000 |  |
Federal net operating loss carryforwards expire | 2014 through 2033 |  |
California research and development tax credit carryforwards | 6,100,000 |  |
Domestic Country [Member] |  |  |
Business Acquisition [Line Items] |  |  |
U.S - based valuation allowance | 58,900,000 | 32,100,000 |
Federal net operating loss carryforwards expire | 2027 through 2031 |  |
California research and development tax credit carryforwards | $ 3,000,000 |  |

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- Definition This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties. + References 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph c -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 FASB Interpretation (FIN) -Number 48 -Paragraph 15, 16 -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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