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Fair Value Of Financial Instruments (Details) (USD $) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2012 item | Dec. 31, 2011 | Jun. 30, 2011 | Dec. 31, 2010
Fair Value of Financial Instruments |  |  |  |
Cash and cash equivalents, cost | $ 3,970,000 | $ 40,025,000 | $ 4,420,000 | $ 14,340,000
Cash and cash equivalents, fair value | 3,970,000 | 40,025,000 |  |
Estimated fair values of financial instruments |  |  |  |
Unrealized Gains | 16,000 | 6,000 |  |
Unrealized Losses | (17,000) | (5,000) |  |
Fair value of available-for-sale securities with unrealized losses | 28,200,000 |  |  |
Number of maturity groups | 2 |  |  |
Investments by rolling maturity, Cost |  |  |  |
Due within 1 year | 26,340,000 |  |  |
Due in 1-2 years | 18,630,000 |  |  |
Total | 44,970,000 | 17,949,000 |  |
Investments by fiscal year maturity, Cost |  |  |  |
Due within 1 year |  | 9,412,000 |  |
Due in 1-2 years |  | 8,537,000 |  |
Total | 44,970,000 | 17,949,000 |  |
Investments by rolling maturity, Unrealized Gains |  |  |  |
Due within 1 year | 11,000 |  |  |
Due in 1-2 years | 5,000 |  |  |
Total | 16,000 | 6,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Due within 1 year |  | 3,000 |  |
Due in 1-2 years |  | 3,000 |  |
Total | 16,000 | 6,000 |  |
Investments by rolling maturity, Unrealized Losses |  |  |  |
Due within 1 year | (8,000) |  |  |
Due in 1-2 years | (9,000) |  |  |
Total | (17,000) | (5,000) |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Due within 1 year |  | (2,000) |  |
Due in 1-2 years |  | (3,000) |  |
Total | (17,000) | (5,000) |  |
Investments by rolling maturity, Fair Value |  |  |  |
Due within 1 year | 26,343,000 |  |  |
Due in 1-2 years | 18,626,000 |  |  |
Total | 44,969,000 | 17,950,000 |  |
Investments by fiscal year maturity, Fair Value |  |  |  |
Due within 1 year |  | 9,413,000 |  |
Due in 1-2 years |  | 8,537,000 |  |
Total | 44,969,000 | 17,950,000 |  |
Short-term investments |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 26,340,000 | 9,412,000 |  |
Unrealized Gains | 11,000 | 3,000 |  |
Unrealized Losses | (8,000) | (2,000) |  |
Fair Value | 26,343,000 | 9,413,000 |  |
Investments by rolling maturity, Unrealized Gains |  |  |  |
Total | 11,000 | 3,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 11,000 | 3,000 |  |
Investments by rolling maturity, Unrealized Losses |  |  |  |
Total | (8,000) | (2,000) |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total | (8,000) | (2,000) |  |
Short-term investments | U.S. government debt securities |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 8,130,000 | 4,834,000 |  |
Unrealized Gains | 1,000 | 2,000 |  |
Unrealized Losses | (3,000) |  |  |
Fair Value | 8,128,000 | 4,836,000 |  |
Investments by rolling maturity, Unrealized Gains |  |  |  |
Total | 1,000 | 2,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 1,000 | 2,000 |  |
Investments by rolling maturity, Unrealized Losses |  |  |  |
Total | (3,000) |  |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total | (3,000) |  |  |
Short-term investments | Corporate notes and commercial paper |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 14,143,000 |  |  |
Unrealized Gains | 7,000 |  |  |
Unrealized Losses | (4,000) |  |  |
Fair Value | 14,146,000 |  |  |
Investments by rolling maturity, Unrealized Gains |  |  |  |
Total | 7,000 |  |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 7,000 |  |  |
Investments by rolling maturity, Unrealized Losses |  |  |  |
Total | (4,000) |  |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total | (4,000) |  |  |
Short-term investments | Corporate notes |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost |  | 4,578,000 |  |
Unrealized Gains |  | 1,000 |  |
Unrealized Losses |  | (2,000) |  |
Fair Value |  | 4,577,000 |  |
Investments by rolling maturity, Unrealized Gains |  |  |  |
Total |  | 1,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total |  | 1,000 |  |
Investments by rolling maturity, Unrealized Losses |  |  |  |
Total |  | (2,000) |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total |  | (2,000) |  |
Short-term investments | Certificates of deposit |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 4,067,000 |  |  |
Unrealized Gains | 3,000 |  |  |
Unrealized Losses | (1,000) |  |  |
Fair Value | 4,069,000 |  |  |
Investments by rolling maturity, Unrealized Gains |  |  |  |
Total | 3,000 |  |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 3,000 |  |  |
Investments by rolling maturity, Unrealized Losses |  |  |  |
Total | (1,000) |  |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total | (1,000) |  |  |
Long-term investments |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 18,630,000 | 8,537,000 |  |
Unrealized Gains | 5,000 | 3,000 |  |
Unrealized Losses | (9,000) | (3,000) |  |
Fair Value | 18,626,000 | 8,537,000 |  |
Investments by rolling maturity, Unrealized Gains |  |  |  |
Total | 5,000 | 3,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 5,000 | 3,000 |  |
Investments by rolling maturity, Unrealized Losses |  |  |  |
Total | (9,000) | (3,000) |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total | (9,000) | (3,000) |  |
Long-term investments | U.S. government debt securities |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 11,641,000 | 5,721,000 |  |
Unrealized Gains | 2,000 | 1,000 |  |
Unrealized Losses | (4,000) | (1,000) |  |
Fair Value | 11,639,000 | 5,721,000 |  |
Investments by rolling maturity, Unrealized Gains |  |  |  |
Total | 2,000 | 1,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 2,000 | 1,000 |  |
Investments by rolling maturity, Unrealized Losses |  |  |  |
Total | (4,000) | (1,000) |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total | (4,000) | (1,000) |  |
Long-term investments | Corporate notes |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 6,268,000 | 2,816,000 |  |
Unrealized Gains | 3,000 | 2,000 |  |
Unrealized Losses | (5,000) | (2,000) |  |
Fair Value | 6,266,000 | 2,816,000 |  |
Investments by rolling maturity, Unrealized Gains |  |  |  |
Total | 3,000 | 2,000 |  |
Investments by fiscal year maturity, Unrealized Gains |  |  |  |
Total | 3,000 | 2,000 |  |
Investments by rolling maturity, Unrealized Losses |  |  |  |
Total | (5,000) | (2,000) |  |
Investments by fiscal year maturity, Unrealized Losses |  |  |  |
Total | (5,000) | (2,000) |  |
Long-term investments | Certificates of deposit |  |  |  |
Estimated fair values of financial instruments |  |  |  |
Cost | 721,000 |  |  |
Fair Value | $ 721,000 |  |  |

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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(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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