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Investments in Marketable Securities and Fair Value Measurements (Details) (USD $) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2011
Cash, cash equivalents and investments [Abstract] |  |  |  |
Cash | $ 24,114,000 | $ 26,250,000 |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |
Money market funds | 3,609,000 | 4,384,000 |  |
Cash Equivalents, at Carrying Value, Total | 27,723,000 | 30,634,000 | 35,503,000 | 26,156,000
Amortized Cost | 48,445,000 | 50,144,000 |  |
Gross Unrealized Gain | 11,000 | 16,000 |  |
Gross Unrealized (Loss) | (34,000) | (65,000) |  |
Fair Value | 48,422,000 | 50,095,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Due within 1 year | 8,405,000 | 10,288,000 |  |
Due after 1 through 5 years | 12,317,000 | 9,222,000 |  |
Investments, amortized cost | 20,722,000 | 19,510,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Due within 1 year | 8,412,000 | 10,270,000 |  |
Due after 1 through 5 years | 12,287,000 | 9,191,000 |  |
Investments, fair value | 20,699,000 | 19,461,000 |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |
Fair value, in loss position less than twelve months | 15,409,000 | 8,323,000 |  |
Gross unrealized loss, in loss position less than twelve months | (34,000) | (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 | 15,409,000 | 10,024,000 |  |
Gross unrealized loss, total in loss position | (34,000) | (65,000) |  |
Minority Investments [Abstract] |  |  |  |
Minority investments in unconsolidated privately-held companies | 325,000 | 392,000 |  |
Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Assets, fair value | 24,308,000 | 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 | 3,609,000 | 4,384,000 |  |
Liabilities [Abstract] |  |  |  |
Liabilities, fair value | 0 | 0 |  |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Assets, fair value | 20,699,000 | 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 | 3,609,000 | 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 | 3,609,000 | 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 | 6,316,000 | 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 | 6,316,000 | 6,645,000 |  |
Recurring [Member] | Corporate bonds [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 14,383,000 | 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 | 14,383,000 | 12,816,000 |  |
Other assets [Member] |  |  |  |
Minority Investments [Abstract] |  |  |  |
Investments in privately-held companies | 10,600,000 | 9,400,000 |  |
Minority investments in unconsolidated privately-held companies | 325,000 | 392,000 |  |
Certificates of deposit [Member] |  |  |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |
Amortized Cost | 6,320,000 | 6,638,000 |  |
Gross Unrealized Gain | 5,000 | 9,000 |  |
Gross Unrealized (Loss) | (9,000) | (2,000) |  |
Fair Value | 6,316,000 | 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 | 3,671,000 | 1,877,000 |  |
Gross unrealized loss, in loss position less than twelve months | (9,000) | (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 | 3,671,000 | 2,076,000 |  |
Gross unrealized loss, total in loss position | (9,000) | (2,000) |  |
Corporate bonds [Member] |  |  |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |
Amortized Cost | 14,402,000 | 12,872,000 |  |
Gross Unrealized Gain | 6,000 | 7,000 |  |
Gross Unrealized (Loss) | (25,000) | (63,000) |  |
Fair Value | 14,383,000 | 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 | 11,738,000 | 6,446,000 |  |
Gross unrealized loss, in loss position less than twelve months | (25,000) | (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 | 11,738,000 | 7,948,000 |  |
Gross unrealized loss, total in loss position | (25,000) | (63,000) |  |
Total Investments [Member] |  |  |  |
Cash Equivalents, at Carrying Value [Abstract] |  |  |  |
Amortized Cost | 20,722,000 | 19,510,000 |  |
Gross Unrealized Gain | 11,000 | 16,000 |  |
Gross Unrealized (Loss) | (34,000) | (65,000) |  |
Fair Value | $ 20,699,000 | $ 19,461,000 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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