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Cash, Cash Equivalents and Investments (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Cash, cash equivalents and investments [Abstract] |  |  |  |
Cash | $ 26,250,000 | $ 25,299,000 |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |
Money Market Funds | 4,384,000 | 857,000 |  |
Cash Equivalents, at Carrying Value, Total | 4,384,000 | 857,000 |  |
Cash and Cash Equivalents, at Carrying Value, Total | 30,634,000 | 26,156,000 | 23,724,000 | 16,934,000
Amortized Cost | 50,144,000 | 40,776,000 |  |
Gross Unrealized Gain | 16,000 | 7,000 |  |
Gross Unrealized (Loss) | (65,000) | (141,000) |  |
Fair Value | 50,095,000 | 40,642,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Due within 1 year | 10,288,000 | 5,521,000 |  |
Due after 1 through 5 years | 9,222,000 | 9,099,000 |  |
Investments, amortized cost | 19,510,000 | 14,620,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Due within 1 year | 10,270,000 | 5,505,000 |  |
Due after 1 through 5 years | 9,191,000 | 8,981,000 |  |
Investments, fair value | 19,461,000 | 14,486,000 |  |
Gross realized losses on available-for-sale securities | 0 | 8,000 | (346,000) |
Gross realized gains on available-for-sale securities |  | 346,000 | 346,000 |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |
Fair value, in loss position less than twelve months | 8,323,000 | 10,098,000 |  |
Gross unrealized loss, in loss position less than twelve months | (41,000) | (141,000) |  |
Fair value, in loss position greater than twelve months | 1,701,000 |  |  |
Gross unrealized loss, in loss position greater than twelve months | (24,000) |  |  |
Fair value, total in loss position | 10,024,000 | 10,098,000 |  |
Gross unrealized loss, total in loss position | (65,000) | (141,000) |  |
Investment in privately held Companies [Abstract] |  |  |  |
Minority investments in unconsolidated privately-held companies | 392,000 | 392,000 |  |
Assets [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 30,634,000 | 26,156,000 |  |
Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Assets, fair value | 23,845,000 | 15,343,000 |  |
Liabilities [Abstract] |  |  |  |
Liabilities, fair value | 0 | 0 |  |
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |  |
Assets, fair value | 4,384,000 | 857,000 |  |
Liabilities [Abstract] |  |  |  |
Liabilities, fair value | 0 | 0 |  |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Assets, fair value | 19,461,000 | 14,486,000 |  |
Liabilities [Abstract] |  |  |  |
Liabilities, fair value | 0 | 0 |  |
Recurring [Member] | Money market fund - cash [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 4,384,000 | 857,000 |  |
Recurring [Member] | Money market fund - cash [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 4,384,000 | 857,000 |  |
Recurring [Member] | Money market fund - cash [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0 |  |
Recurring [Member] | Certificates of deposit [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 6,645,000 | 3,563,000 |  |
Recurring [Member] | Certificates of deposit [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 0 | 0 |  |
Recurring [Member] | Certificates of deposit [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 6,645,000 | 3,563,000 |  |
Recurring [Member] | US Treasury and agency securities [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 1,199,000 |  |
Recurring [Member] | US Treasury and agency securities [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 0 |  |
Recurring [Member] | US Treasury and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 1,199,000 |  |
Recurring [Member] | Corporate bonds [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 12,816,000 | 9,724,000 |  |
Recurring [Member] | Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 12,816,000 | 9,724,000 |  |
Other assets [Member] |  |  |  |
Investment in privately held Companies [Abstract] |  |  |  |
Investments in privately-held companies | 9,400,000 | 8,300,000 |  |
Minority investments in unconsolidated privately-held companies | 392,000 | 392,000 |  |
Certificates of deposit [Member] |  |  |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |
Amortized Cost | 6,638,000 | 3,561,000 |  |
Gross Unrealized Gain | 9,000 | 5,000 |  |
Gross Unrealized (Loss) | (2,000) | (3,000) |  |
Fair Value | 6,645,000 | 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 | 1,877,000 | 678,000 |  |
Gross unrealized loss, in loss position less than twelve months | (1,000) | (3,000) |  |
Fair value, in loss position greater than twelve months | 199,000 |  |  |
Gross unrealized loss, in loss position greater than twelve months | (1,000) |  |  |
Fair value, total in loss position | 2,076,000 | 678,000 |  |
Gross unrealized loss, total in loss position | (2,000) | (3,000) |  |
US Treasury and agency securities [Member] |  |  |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |
Amortized Cost | 0 | 1,200,000 |  |
Gross Unrealized Gain | 0 | 0 |  |
Gross Unrealized (Loss) | 0 | (1,000) |  |
Fair Value | 0 | 1,199,000 |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |
Fair value, in loss position less than twelve months |  | 1,199,000 |  |
Gross unrealized loss, in loss position less than twelve months |  | (1,000) |  |
Fair value, total in loss position |  | 1,199,000 |  |
Gross unrealized loss, total in loss position |  | (1,000) |  |
Corporate bonds [Member] |  |  |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |
Amortized Cost | 12,872,000 | 9,859,000 |  |
Gross Unrealized Gain | 7,000 | 2,000 |  |
Gross Unrealized (Loss) | (63,000) | (137,000) |  |
Fair Value | 12,816,000 | 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 | 6,446,000 | 8,221,000 |  |
Gross unrealized loss, in loss position less than twelve months | (40,000) | (137,000) |  |
Fair value, in loss position greater than twelve months | 1,502,000 |  |  |
Gross unrealized loss, in loss position greater than twelve months | (23,000) |  |  |
Fair value, total in loss position | 7,948,000 | 8,221,000 |  |
Gross unrealized loss, total in loss position | (63,000) | (137,000) |  |
Total Investments [Member] |  |  |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |
Amortized Cost | 19,510,000 | 14,620,000 |  |
Gross Unrealized Gain | 16,000 | 7,000 |  |
Gross Unrealized (Loss) | (65,000) | (141,000) |  |
Fair Value | $ 19,461,000 | $ 14,486,000 |  |

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