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Investments and Fair Value Measurements (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Cash, cash equivalents and investments [Abstract] |  |  |  |  |  |  |
Cash |  | $ 17,337,000 |  | $ 17,337,000 |  | $ 22,337,000 |
Cash equivalents [Abstract] |  |  |  |  |  |  |
Certificates of deposit, amortized cost | [1] | 11,303,000 |  | 11,303,000 |  | 6,454,000 |
Certificates of deposit, gross unrealized gain | [1] |  |  | 0 |  | 0 |
Certificates of deposit, gross unrealized loss | [1] |  |  | 0 |  | 0 |
Certificates of deposit, fair value | [1] | 11,303,000 |  | 11,303,000 |  | 6,454,000 |
Money market fund |  | 0 |  | 0 |  | 23,000 |
Total cash and cash equivalents |  | 28,640,000 | $ 26,307,000 | 28,640,000 | $ 26,307,000 | 28,814,000 | $ 24,961,000
Amortized Cost |  | 45,951,000 |  | 45,951,000 |  | 48,267,000 |
Gross Unrealized Gain |  | 376,000 |  | 376,000 |  | 712,000 |
Gross Unrealized (Loss) |  | (56,000) |  | (56,000) |  | (42,000) |
Fair Value |  | 46,271,000 |  | 46,271,000 |  | 48,937,000 |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |  |  |  |
Due within 1 year |  | 3,560,000 |  | 3,560,000 |  | 11,631,000 |
Due after 1 through 5 years |  | 13,751,000 |  | 13,751,000 |  | 7,822,000 |
Investments, amortized cost |  | 17,311,000 |  | 17,311,000 |  | 19,453,000 |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |  |  |  |
Due within 1 year |  | 3,932,000 |  | 3,932,000 |  | 12,340,000 |
Due after 1 through 5 years |  | 13,699,000 |  | 13,699,000 |  | 7,783,000 |
Investments, fair value |  | 17,631,000 |  | 17,631,000 |  | 20,123,000 |
Proceeds from sales of available-for-sale investments |  | 515,000 | 346,000 | 902,000 | 346,000 |  |
Available-for-sale investments, expenses |  | 23,000 | 22,000 | 43,000 | 22,000 |  |
Gross realized gains from sales of available-for-sale investments |  | 492,000 | $ 324,000 | 859,000 | $ 324,000 |  |
Unrealized gain, net of tax |  |  |  | 375,000 |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |  |
Fair value, in loss position less than twelve months |  | 15,376,000 |  | 15,376,000 |  | 8,262,000 |
Gross unrealized loss, in loss position less than twelve months |  |  |  | (55,000) |  | (40,000) |
Fair value, in loss position greater than twelve months |  | 1,199,000 |  | 1,199,000 |  | 4,309,000 |
Gross unrealized loss, in loss position greater than twelve months |  |  |  | (1,000) |  | (2,000) |
Fair value, total in loss position |  | 16,575,000 |  | 16,575,000 |  | 12,571,000 |
Gross unrealized loss, total in loss position |  |  |  | (56,000) |  | (42,000) |
Minority Investments [Abstract] |  |  |  |  |  |  |
Minority investments in unconsolidated privately-held companies |  |  |  |  |  | 200,000 |
Other Assets [Member] |  |  |  |  |  |  |
Minority Investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  | 12,600,000 |  | 12,600,000 |  | 12,100,000 |
Minority investments in unconsolidated privately-held companies |  |  |  |  |  | 200,000 |
Certificates of Deposit [Member] |  |  |  |  |  |  |
Cash equivalents [Abstract] |  |  |  |  |  |  |
Amortized Cost | [2] | 8,105,000 |  | 8,105,000 |  | 10,195,000 |
Gross Unrealized Gain | [2] | 1,000 |  | 1,000 |  | 1,000 |
Gross Unrealized (Loss) | [2] | (16,000) |  | (16,000) |  | (13,000) |
Fair Value | [2] | 8,090,000 |  | 8,090,000 |  | 10,183,000 |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |  |
Fair value, in loss position less than twelve months |  | 6,410,000 |  | 6,410,000 |  | 4,492,000 |
Gross unrealized loss, in loss position less than twelve months |  |  |  | (15,000) |  | (13,000) |
Fair value, in loss position greater than twelve months |  | 1,199,000 |  | 1,199,000 |  | 0 |
Gross unrealized loss, in loss position greater than twelve months |  |  |  | (1,000) |  | 0 |
Fair value, total in loss position |  | 7,609,000 |  | 7,609,000 |  | 4,492,000 |
Gross unrealized loss, total in loss position |  |  |  | (16,000) |  | (13,000) |
Corporate Bonds [Member] |  |  |  |  |  |  |
Cash equivalents [Abstract] |  |  |  |  |  |  |
Amortized Cost |  | 9,006,000 |  | 9,006,000 |  | 9,214,000 |
Gross Unrealized Gain |  | 0 |  | 0 |  | 1,000 |
Gross Unrealized (Loss) |  | (40,000) |  | (40,000) |  | (29,000) |
Fair Value |  | 8,966,000 |  | 8,966,000 |  | 9,186,000 |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |  |  |
Fair value, in loss position less than twelve months |  | 8,966,000 |  | 8,966,000 |  | 3,770,000 |
Gross unrealized loss, in loss position less than twelve months |  |  |  | (40,000) |  | (27,000) |
Fair value, in loss position greater than twelve months |  | 0 |  | 0 |  | 4,309,000 |
Gross unrealized loss, in loss position greater than twelve months |  |  |  | 0 |  | (2,000) |
Fair value, total in loss position |  | 8,966,000 |  | 8,966,000 |  | 8,079,000 |
Gross unrealized loss, total in loss position |  |  |  | (40,000) |  | (29,000) |
Corporate Equity Securities [Member] |  |  |  |  |  |  |
Cash equivalents [Abstract] |  |  |  |  |  |  |
Amortized Cost |  | 200,000 |  | 200,000 |  | 44,000 |
Gross Unrealized Gain |  | 375,000 |  | 375,000 |  | 710,000 |
Gross Unrealized (Loss) |  | 0 |  | 0 |  | 0 |
Fair Value |  | 575,000 |  | 575,000 |  | 754,000 |
Total Investments [Member] |  |  |  |  |  |  |
Cash equivalents [Abstract] |  |  |  |  |  |  |
Amortized Cost |  | 17,311,000 |  | 17,311,000 |  | 19,453,000 |
Gross Unrealized Gain |  | 376,000 |  | 376,000 |  | 712,000 |
Gross Unrealized (Loss) |  | (56,000) |  | (56,000) |  | (42,000) |
Fair Value |  | $ 17,631,000 |  | $ 17,631,000 |  | $ 20,123,000 |
[1] | Certificate of deposit with original maturities of less than 90 days.
[2] | Certificate of deposit with original maturities of more than 90 days.

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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. 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 -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 + Details
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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 -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: 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=56944662&loc=d3e3044-108585 Reference 4: 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 5: 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 + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related 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 Reference 2: 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 + 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 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 2: 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 + 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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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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