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Fair Value of Financial Instruments (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2012 Item | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Fair Value of Financial Instruments |  |  |  |
Cash and cash equivalents, cost | $ 2,529,000 | $ 40,025,000 | $ 14,340,000 | $ 7,123,000
Cash and cash equivalents, fair value | 2,529,000 | 40,025,000 |  |
Estimated fair values of financial instruments |  |  |  |
Unrealized Gains | 17,000 | 6,000 |  |
Unrealized Losses | (6,000) | (5,000) |  |
Fair value of available-for-sale securities with unrealized losses | 8,200,000 |  |  |
Number of maturity groups | 2 |  |  |
Investments by fiscal year maturity, Cost |  |  |  |
Due within 1 year | 30,790,000 | 9,412,000 |  |
Due in 1-2 years | 7,380,000 | 8,537,000 |  |
Total | 38,170,000 | 17,949,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Due within 1 year | 14,000 | 3,000 |  |
Due in 1-2 years | 3,000 | 3,000 |  |
Total | 17,000 | 6,000 |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Due within 1 year | (6,000) | (2,000) |  |
Due in 1-2 years |  | (3,000) |  |
Total | (6,000) | (5,000) |  |
Investments by fiscal year maturity, Fair Value |  |  |  |
Due within 1 year | 30,798,000 | 9,413,000 |  |
Due in 1-2 years | 7,383,000 | 8,537,000 |  |
Total | 38,181,000 | 17,950,000 |  |
Short-term investments |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 30,790,000 | 9,412,000 |  |
Unrealized Gains | 14,000 | 3,000 |  |
Unrealized Losses | (6,000) | (2,000) |  |
Fair Value | 30,798,000 | 9,413,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 14,000 | 3,000 |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total | (6,000) | (2,000) |  |
Short-term investments | U.S. government debt securities |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 15,852,000 | 4,834,000 |  |
Unrealized Gains | 6,000 | 2,000 |  |
Unrealized Losses | (2,000) |  |  |
Fair Value | 15,856,000 | 4,836,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 6,000 | 2,000 |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total | (2,000) |  |  |
Short-term investments | Corporate notes |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 14,471,000 | 4,578,000 |  |
Unrealized Gains | 8,000 | 1,000 |  |
Unrealized Losses | (4,000) | (2,000) |  |
Fair Value | 14,475,000 | 4,577,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 8,000 | 1,000 |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total | (4,000) | (2,000) |  |
Short-term investments | Certificates of deposit |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 467,000 |  |  |
Fair Value | 467,000 |  |  |
Long-term investments |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 7,380,000 | 8,537,000 |  |
Unrealized Gains | 3,000 | 3,000 |  |
Unrealized Losses |  | (3,000) |  |
Fair Value | 7,383,000 | 8,537,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 3,000 | 3,000 |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total |  | (3,000) |  |
Long-term investments | U.S. government debt securities |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 6,330,000 | 5,721,000 |  |
Unrealized Gains | 2,000 | 1,000 |  |
Unrealized Losses |  | (1,000) |  |
Fair Value | 6,332,000 | 5,721,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 2,000 | 1,000 |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total |  | (1,000) |  |
Long-term investments | Corporate notes |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 1,050,000 | 2,816,000 |  |
Unrealized Gains | 1,000 | 2,000 |  |
Unrealized Losses |  | (2,000) |  |
Fair Value | 1,051,000 | 2,816,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 1,000 | 2,000 |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total |  | $ (2,000) |  |

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + 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 -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 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=6943989&loc=d3e3044-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: 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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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