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Investments and Fair Value Measurements (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Cash, cash equivalents and investments [Abstract] |  |  |  |  |
Cash | $ 25,789,000 |  | $ 26,250,000 |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |  |
Money market funds | 3,000 |  | 4,384,000 |  |
Cash Equivalents, at Carrying Value, Total | 3,000 |  | 4,384,000 |  |
Cash and Cash Equivalents, at Carrying Value, Total | 25,792,000 | 31,156,000 | 30,634,000 | [1] | 26,156,000
Amortized Cost | 49,436,000 |  | 50,144,000 |  |
Gross Unrealized Gain | 12,000 |  | 16,000 |  |
Gross Unrealized (Loss) | (78,000) |  | (65,000) |  |
Fair Value | 49,370,000 |  | 50,095,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |  |
Due within 1 year | 6,536,000 |  | 10,288,000 |  |
Due after 1 through 5 years | 17,108,000 |  | 9,222,000 |  |
Investments, amortized cost | 23,644,000 |  | 19,510,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |  |
Due within 1 year | 6,540,000 |  | 10,270,000 |  |
Due after 1 through 5 years | 17,038,000 |  | 9,191,000 |  |
Investments, fair value | 23,578,000 |  | 19,461,000 |  |
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities | 8,100,000 | 2,700,000 |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months | 15,741,000 |  | 8,323,000 |  |
Gross unrealized loss, in loss position less than twelve months | (78,000) |  | (41,000) |  |
Fair value, in loss position greater than twelve months | 0 |  | 1,701,000 |  |
Gross unrealized loss, in loss position greater than twelve months | 0 |  | (24,000) |  |
Fair value, total in loss position | 15,741,000 |  | 10,024,000 |  |
Gross unrealized loss, total in loss position | (78,000) |  | (65,000) |  |
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 | 25,792,000 |  | 30,634,000 |  |
Recurring [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Assets, fair value | 23,581,000 |  | 23,845,000 |  |
Liabilities [Abstract] |  |  |  |  |
Liabilities, fair value | 0 |  | 0 |  |
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Assets, fair value | 3,000 |  | 4,384,000 |  |
Liabilities [Abstract] |  |  |  |  |
Liabilities, fair value | 0 |  | 0 |  |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Assets, fair value | 23,578,000 |  | 19,461,000 |  |
Liabilities [Abstract] |  |  |  |  |
Liabilities, fair value | 0 |  | 0 |  |
Recurring [Member] | Money market fund - cash [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 3,000 |  | 4,384,000 |  |
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 | 3,000 |  | 4,384,000 |  |
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 | 6,999,000 |  | 6,645,000 |  |
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 | 6,999,000 |  | 6,645,000 |  |
Recurring [Member] | Corporate bonds [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 16,579,000 |  | 12,816,000 |  |
Recurring [Member] | Corporate bonds [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] | Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 16,579,000 |  | 12,816,000 |  |
Other assets [Member] |  |  |  |  |
Investment in privately held Companies [Abstract] |  |  |  |  |
Investments in privately-held companies | 9,500,000 |  | 9,400,000 |  |
Minority investments in unconsolidated privately-held companies | 392,000 |  | 392,000 |  |
Certificates of deposit [Member] |  |  |  |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |  |
Amortized Cost | 6,998,000 |  | 6,638,000 |  |
Gross Unrealized Gain | 8,000 |  | 9,000 |  |
Gross Unrealized (Loss) | (7,000) |  | (2,000) |  |
Fair Value | 6,999,000 |  | 6,645,000 |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months | 2,953,000 |  | 1,877,000 |  |
Gross unrealized loss, in loss position less than twelve months | (7,000) |  | (1,000) |  |
Fair value, in loss position greater than twelve months | 0 |  | 199,000 |  |
Gross unrealized loss, in loss position greater than twelve months | 0 |  | (1,000) |  |
Fair value, total in loss position | 2,953,000 |  | 2,076,000 |  |
Gross unrealized loss, total in loss position | (7,000) |  | (2,000) |  |
Corporate bonds [Member] |  |  |  |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |  |
Amortized Cost | 16,646,000 |  | 12,872,000 |  |
Gross Unrealized Gain | 4,000 |  | 7,000 |  |
Gross Unrealized (Loss) | (71,000) |  | (63,000) |  |
Fair Value | 16,579,000 |  | 12,816,000 |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months | 12,788,000 |  | 6,446,000 |  |
Gross unrealized loss, in loss position less than twelve months | (71,000) |  | (40,000) |  |
Fair value, in loss position greater than twelve months | 0 |  | 1,502,000 |  |
Gross unrealized loss, in loss position greater than twelve months | 0 |  | (23,000) |  |
Fair value, total in loss position | 12,788,000 |  | 7,948,000 |  |
Gross unrealized loss, total in loss position | (71,000) |  | (63,000) |  |
Total Investments [Member] |  |  |  |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |  |
Amortized Cost | 23,644,000 |  | 19,510,000 |  |
Gross Unrealized Gain | 12,000 |  | 16,000 |  |
Gross Unrealized (Loss) | (78,000) |  | (65,000) |  |
Fair Value | $ 23,578,000 |  | $ 19,461,000 |  |
[1] | The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.

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