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Investments and Fair Value Measurements (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Cash, cash equivalents and investments [Abstract] |  |  |  |  |
Amortized Cost | $ 47,096,000 |  | $ 47,096,000 |  | $ 40,776,000
Gross Unrealized Gain | 14,000 |  | 14,000 |  | 7,000
Gross Unrealized (Loss) | (42,000) |  | (42,000) |  | (141,000)
Fair Value | 47,068,000 |  | 47,068,000 |  | 40,642,000
Contractual maturities on investments, amortized cost basis |  |  |  |  |
Due within 1 year | 11,494,000 |  | 11,494,000 |  | 5,521,000
Due after 1 through 5 years | 4,321,000 |  | 4,321,000 |  | 9,099,000
Investments, amortized cost | 15,815,000 |  | 15,815,000 |  | 14,620,000
Contractual maturities on investments, fair value basis |  |  |  |  |
Due within 1 year | 11,465,000 |  | 11,465,000 |  | 5,505,000
Due after 1 through 5 years | 4,322,000 |  | 4,322,000 |  | 8,981,000
Investments, fair value | 15,787,000 |  | 15,787,000 |  | 14,486,000
Gross realized loss on available-for-sale securities | 0 | 3,000 | 0 | 8,000 |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months | 3,752,000 |  | 3,752,000 |  |
Fair value, in loss position greater than twelve months | 5,074,000 |  | 5,074,000 |  |
Fair value, total in loss position | 8,826,000 |  | 8,826,000 |  |
Gross unrealized loss, in loss position less than twelve months | (7,000) |  | (7,000) |  |
Gross unrealized loss, in loss position greater than twelve months | (35,000) |  | (35,000) |  |
Gross unrealized loss, total in loss position | (42,000) |  | (42,000) |  |
Investment in privately held Companies [Abstract] |  |  |  |  |
Minority investments in unconsolidated privately-held companies | 392,000 |  | 392,000 |  | 392,000
Recurring [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 15,793,000 |  | 15,793,000 |  |
Liabilities: |  |  |  |  |
Liabilities, fair value | 0 |  | 0 |  |
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 6,000 |  | 6,000 |  |
Liabilities: |  |  |  |  |
Liabilities, fair value | 0 |  | 0 |  |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 15,787,000 |  | 15,787,000 |  |
Liabilities: |  |  |  |  |
Liabilities, fair value | 0 |  | 0 |  |
Recurring [Member] | Money market fund [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 6,000 |  | 6,000 |  |
Recurring [Member] | Money market fund [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 6,000 |  | 6,000 |  |
Recurring [Member] | Money market fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 0 |  | 0 |  |
Recurring [Member] | Certificates of deposit [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 6,397,000 |  | 6,397,000 |  |
Recurring [Member] | Certificates of deposit [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 0 |  | 0 |  |
Recurring [Member] | Certificates of deposit [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 6,397,000 |  | 6,397,000 |  |
Recurring [Member] | US Treasury and agency securities [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 1,200,000 |  | 1,200,000 |  |
Recurring [Member] | US Treasury and agency securities [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 0 |  | 0 |  |
Recurring [Member] | US Treasury and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 1,200,000 |  | 1,200,000 |  |
Recurring [Member] | Corporate bonds [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 8,190,000 |  | 8,190,000 |  |
Recurring [Member] | Corporate bonds [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 0 |  | 0 |  |
Recurring [Member] | Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets, fair value | 8,190,000 |  | 8,190,000 |  |
Other assets [Member] |  |  |  |  |
Investment in privately held Companies [Abstract] |  |  |  |  |
Investments in privately-held companies | 8,800,000 |  | 8,800,000 |  | 8,300,000
Money market fund [Member] |  |  |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |  |  |
Amortized Cost | 6,000 |  | 6,000 |  | 857,000
Gross Unrealized Gain | 0 |  | 0 |  | 0
Gross Unrealized (Loss) | 0 |  | 0 |  | 0
Fair Value | 6,000 |  | 6,000 |  | 857,000
Certificates of deposit [Member] |  |  |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |  |  |
Amortized Cost | 6,399,000 |  | 6,399,000 |  | 3,561,000
Gross Unrealized Gain | 5,000 |  | 5,000 |  | 5,000
Gross Unrealized (Loss) | (7,000) |  | (7,000) |  | (3,000)
Fair Value | 6,397,000 |  | 6,397,000 |  | 3,563,000
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months | 3,752,000 |  | 3,752,000 |  |
Fair value, in loss position greater than twelve months | 0 |  | 0 |  |
Fair value, total in loss position | 3,752,000 |  | 3,752,000 |  |
Gross unrealized loss, in loss position less than twelve months | (7,000) |  | (7,000) |  |
Gross unrealized loss, in loss position greater than twelve months | 0 |  | 0 |  |
Gross unrealized loss, total in loss position | (7,000) |  | (7,000) |  |
US Treasury and agency securities [Member] |  |  |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |  |  |
Amortized Cost | 1,200,000 |  | 1,200,000 |  | 1,200,000
Gross Unrealized Gain | 0 |  | 0 |  | 0
Gross Unrealized (Loss) | 0 |  | 0 |  | (1,000)
Fair Value | 1,200,000 |  | 1,200,000 |  | 1,199,000
Corporate bonds [Member] |  |  |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |  |  |
Amortized Cost | 8,216,000 |  | 8,216,000 |  | 9,859,000
Gross Unrealized Gain | 9,000 |  | 9,000 |  | 2,000
Gross Unrealized (Loss) | (35,000) |  | (35,000) |  | (137,000)
Fair Value | 8,190,000 |  | 8,190,000 |  | 9,724,000
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months | 0 |  | 0 |  |
Fair value, in loss position greater than twelve months | 5,074,000 |  | 5,074,000 |  |
Fair value, total in loss position | 5,074,000 |  | 5,074,000 |  |
Gross unrealized loss, in loss position less than twelve months | 0 |  | 0 |  |
Gross unrealized loss, in loss position greater than twelve months | (35,000) |  | (35,000) |  |
Gross unrealized loss, total in loss position | (35,000) |  | (35,000) |  |
Investments [Member] |  |  |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |  |  |
Amortized Cost | 15,815,000 |  | 15,815,000 |  | 14,620,000
Gross Unrealized Gain | 14,000 |  | 14,000 |  | 7,000
Gross Unrealized (Loss) | (42,000) |  | (42,000) |  | (141,000)
Fair Value | 15,787,000 |  | 15,787,000 |  | 14,486,000
Cash [Member] |  |  |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |  |  |
Amortized Cost | 31,275,000 |  | 31,275,000 |  | 25,299,000
Gross Unrealized Gain | 0 |  | 0 |  | 0
Gross Unrealized (Loss) | 0 |  | 0 |  | 0
Fair Value | 31,275,000 |  | 31,275,000 |  | 25,299,000
Cash equivalents [Member] |  |  |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |  |  |
Amortized Cost | 6,000 |  | 6,000 |  | 857,000
Gross Unrealized Gain | 0 |  | 0 |  | 0
Gross Unrealized (Loss) | 0 |  | 0 |  | 0
Fair Value | 6,000 |  | 6,000 |  | 857,000
Total cash and cash equivalents [Member] |  |  |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |  |  |
Amortized Cost | 31,281,000 |  | 31,281,000 |  | 26,156,000
Gross Unrealized Gain | 0 |  | 0 |  | 0
Gross Unrealized (Loss) | 0 |  | 0 |  | 0
Fair Value | $ 31,281,000 |  | $ 31,281,000 |  | $ 26,156,000

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- Definition This element represents the aggregate carrying amount of all cost-method investments held by the Company. Generally, such investments do not have readily determinable fair values and are not required to be accounted for by the equity method. The carrying amount of such securities equates to cost, adjusted for other-than-temporary impairment. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries, particularly foreign. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph a -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 Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 5 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 18 -Subparagraph a -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 22 -Subparagraph a -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 4 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 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. + Details
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