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Investments and Fair Value Measurements (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Cash, cash equivalents and investments [Abstract] |  |  |
Amortized Cost | $ 51,466,000 |  | $ 40,776,000
Gross Unrealized Gain | 19,000 |  | 7,000
Gross Unrealized (Loss) | (38,000) |  | (141,000)
Fair Value | 51,447,000 |  | 40,642,000
Contractual maturities on investments, amortized cost basis |  |  |
Due within 1 year | 10,581,000 |  | 5,521,000
Due after 1 through 5 years | 5,382,000 |  | 9,099,000
Investments, amortized cost | 15,963,000 |  | 14,620,000
Contractual maturities on investments, fair value basis |  |  |
Due within 1 year | 10,577,000 |  | 5,505,000
Due after 1 through 5 years | 5,367,000 |  | 8,981,000
Investments, fair value | 15,944,000 |  | 14,486,000
Gross realized loss on available-for-sale securities | 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 | 6,039,000 |  | 10,098,000
Fair value, in loss position greater than twelve months | 1,717,000 |  |
Fair value, total in loss position | 7,756,000 |  | 10,098,000
Gross unrealized loss, in loss position less than twelve months | (20,000) |  | (141,000)
Gross unrealized loss, in loss position greater than twelve months | (18,000) |  |
Gross unrealized loss, total in loss position | (38,000) |  | (141,000)
Investment in privately held Companies [Abstract] |  |  |
Minority investments in unconsolidated privately-held companies | 392,000 |  | 392,000
Recurring [Member] |  |  |
Assets: |  |  |
Assets, fair value | 23,957,000 |  | 15,343,000
Liabilities: |  |  |
Liabilities, fair value | 0 |  | 0
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Assets, fair value | 8,013,000 |  | 857,000
Liabilities: |  |  |
Liabilities, fair value | 0 |  | 0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Assets, fair value | 15,944,000 |  | 14,486,000
Liabilities: |  |  |
Liabilities, fair value | 0 |  | 0
Recurring [Member] | Cash equivalents and investments [Member] | Money market fund [Member] |  |  |
Assets: |  |  |
Assets, fair value | 8,013,000 |  | 857,000
Recurring [Member] | Cash equivalents and investments [Member] | Money market fund [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Assets, fair value | 8,013,000 |  | 857,000
Recurring [Member] | Cash equivalents and investments [Member] | Money market fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Assets, fair value | 0 |  | 0
Recurring [Member] | Cash equivalents and investments [Member] | Certificates of deposit [Member] |  |  |
Assets: |  |  |
Assets, fair value | 6,881,000 |  | 3,563,000
Recurring [Member] | Cash equivalents and investments [Member] | Certificates of deposit [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Assets, fair value | 0 |  | 0
Recurring [Member] | Cash equivalents and investments [Member] | Certificates of deposit [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Assets, fair value | 6,881,000 |  | 3,563,000
Recurring [Member] | Cash equivalents and investments [Member] | US Treasury and agency securities [Member] |  |  |
Assets: |  |  |
Assets, fair value |  |  | 1,199,000
Recurring [Member] | Cash equivalents and investments [Member] | US Treasury and agency securities [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Assets, fair value |  |  | 0
Recurring [Member] | Cash equivalents and investments [Member] | US Treasury and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Assets, fair value |  |  | 1,199,000
Recurring [Member] | Cash equivalents and investments [Member] | Corporate bonds [Member] |  |  |
Assets: |  |  |
Assets, fair value | 9,063,000 |  | 9,724,000
Recurring [Member] | Cash equivalents and investments [Member] | Corporate bonds [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |
Assets: |  |  |
Assets, fair value | 0 |  | 0
Recurring [Member] | Cash equivalents and investments [Member] | Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Assets, fair value | 9,063,000 |  | 9,724,000
Other assets [Member] |  |  |
Investment in privately held Companies [Abstract] |  |  |
Investments in privately-held companies | 9,100,000 |  | 8,300,000
Certificates of deposit [Member] |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |
Fair value, in loss position less than twelve months | 3,314,000 |  | 678,000
Fair value, in loss position greater than twelve months | 200,000 |  |
Fair value, total in loss position | 3,514,000 |  | 678,000
Gross unrealized loss, in loss position less than twelve months | (3,000) |  | (3,000)
Gross unrealized loss, in loss position greater than twelve months | (1,000) |  |
Gross unrealized loss, total in loss position | (4,000) |  | (3,000)
US Treasury and agency securities [Member] |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |
Fair value, in loss position less than twelve months |  |  | 1,199,000
Fair value, total in loss position |  |  | 1,199,000
Gross unrealized loss, in loss position less than twelve months |  |  | (1,000)
Gross unrealized loss, total in loss position |  |  | (1,000)
Corporate bonds [Member] |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |
Fair value, in loss position less than twelve months | 2,725,000 |  | 8,221,000
Fair value, in loss position greater than twelve months | 1,517,000 |  |
Fair value, total in loss position | 4,242,000 |  | 8,221,000
Gross unrealized loss, in loss position less than twelve months | (17,000) |  | (137,000)
Gross unrealized loss, in loss position greater than twelve months | (17,000) |  |
Gross unrealized loss, total in loss position | (34,000) |  | (137,000)
Investments (Available for sale) [Member] |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |
Amortized Cost | 15,963,000 |  | 14,620,000
Gross Unrealized Gain | 19,000 |  | 7,000
Gross Unrealized (Loss) | (38,000) |  | (141,000)
Fair Value | 15,944,000 |  | 14,486,000
Investments (Available for sale) [Member] | Certificates of deposit [Member] |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |
Amortized Cost | 6,878,000 |  | 3,561,000
Gross Unrealized Gain | 7,000 |  | 5,000
Gross Unrealized (Loss) | (4,000) |  | (3,000)
Fair Value | 6,881,000 |  | 3,563,000
Investments (Available for sale) [Member] | US Treasury and agency securities [Member] |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |
Amortized Cost | 0 |  | 1,200,000
Gross Unrealized Gain | 0 |  | 0
Gross Unrealized (Loss) | 0 |  | (1,000)
Fair Value | 0 |  | 1,199,000
Investments (Available for sale) [Member] | Corporate bonds [Member] |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |
Amortized Cost | 9,085,000 |  | 9,859,000
Gross Unrealized Gain | 12,000 |  | 2,000
Gross Unrealized (Loss) | (34,000) |  | (137,000)
Fair Value | 9,063,000 |  | 9,724,000
Cash [Member] |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |
Amortized Cost | 27,490,000 |  | 25,299,000
Gross Unrealized Gain | 0 |  | 0
Gross Unrealized (Loss) | 0 |  | 0
Fair Value | 27,490,000 |  | 25,299,000
Cash equivalents [Member] |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |
Amortized Cost | 8,013,000 |  | 857,000
Gross Unrealized Gain | 0 |  | 0
Gross Unrealized (Loss) | 0 |  | 0
Fair Value | 8,013,000 |  | 857,000
Cash equivalents [Member] | Money market fund [Member] |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |
Amortized Cost | 8,013,000 |  | 857,000
Gross Unrealized Gain | 0 |  | 0
Gross Unrealized (Loss) | 0 |  | 0
Fair Value | 8,013,000 |  | 857,000
Total cash and cash equivalents [Member] |  |  |
Cash, cash equivalents and investments [Abstract] |  |  |
Amortized Cost | 35,503,000 |  | 26,156,000
Gross Unrealized Gain | 0 |  | 0
Gross Unrealized (Loss) | 0 |  | 0
Fair Value | $ 35,503,000 |  | $ 26,156,000

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