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Fair Value Of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2012
Fair Value of Financial Instruments |
Schedule of estimated fair values of financial instruments outstanding |
|  | June 30, 2012 |
|  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |
Cash and cash equivalents |  | $ | 3,970 |  | $ | — |  | $ | — |  | $ | 3,970 |
Short-term investments: |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 8,130 |  | $ | 1 |  | $ | (3 | ) | $ | 8,128 |
Corporate notes and commercial paper |  | 14,143 |  | 7 |  | (4 | ) | 14,146 |
Certificates of deposit |  | 4,067 |  | 3 |  | (1 | ) | 4,069 |
Total short-term investments |  | $ | 26,340 |  | $ | 11 |  | $ | (8 | ) | $ | 26,343 |
Long-term investments: |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 11,641 |  | $ | 2 |  | $ | (4 | ) | $ | 11,639 |
Corporate notes |  | 6,268 |  | 3 |  | (5 | ) | 6,266 |
Certificates of deposit |  | 721 |  | — |  | — |  | 721 |
Total long-term investments |  | $ | 18,630 |  | $ | 5 |  | $ | (9 | ) | $ | 18,626 |
|  | December 31, 2011 |
|  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |
Cash and cash equivalents |  | $ | 40,025 |  | $ | — |  | $ | — |  | $ | 40,025 |
Short-term investments: |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 4,834 |  | $ | 2 |  | $ | — |  | $ | 4,836 |
Corporate notes |  | 4,578 |  | 1 |  | (2 | ) | 4,577 |
Total short-term investments |  | $ | 9,412 |  | $ | 3 |  | $ | (2 | ) | $ | 9,413 |
Long-term investments: |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 5,721 |  | $ | 1 |  | $ | (1 | ) | $ | 5,721 |
Corporate notes |  | 2,816 |  | 2 |  | (2 | ) | 2,816 |
Total long-term investments |  | $ | 8,537 |  | $ | 3 |  | $ | (3 | ) | $ | 8,537 |
Schedule of cost and fair value of investments based on maturity groups |
|  | June 30, 2012 |
|  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |
Due within 1 year |  | $ | 26,340 |  | $ | 11 |  | $ | (8 | ) | $ | 26,343 |
Due in 1-2 years |  | 18,630 |  | 5 |  | (9 | ) | 18,626 |
Total |  | $ | 44,970 |  | $ | 16 |  | $ | (17 | ) | $ | 44,969 |
|  | December 31, 2011 |
|  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |
Due within 1 year |  | $ | 9,412 |  | $ | 3 |  | $ | (2 | ) | $ | 9,413 |
Due in 1-2 years |  | 8,537 |  | 3 |  | (3 | ) | 8,537 |
Total |  | $ | 17,949 |  | $ | 6 |  | $ | (5 | ) | $ | 17,950 |
Schedule of fair value hierarchy for financial assets (cash equivalents and investments) |
|  | June 30, 2012 |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Money market funds |  | $ | 790 |  | $ | 790 |  | $ | — |  | $ | — |
Certificates of deposit |  | 4,790 |  | — |  | 4,790 |  | — |
Corporate notes and commercial paper |  | 22,912 |  | — |  | 22,912 |  | — |
U.S. government debt securities |  | 19,917 |  | — |  | 19,917 |  | — |
Total assets |  | $ | 48,409 |  | $ | 790 |  | $ | 47,619 |  | $ | — |
|  | December 31, 2011 |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Money market funds |  | $ | 2,792 |  | $ | 2,792 |  | $ | — |  | $ | — |
Corporate notes |  | 7,393 |  | — |  | 7,393 |  | — |
U.S. government debt securities |  | 10,557 |  | — |  | 10,557 |  | — |
Total assets |  | $ | 20,742 |  | $ | 2,792 |  | $ | 17,950 |  | $ | — |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring and/or nonrecurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -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 157 -Paragraph 32 -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 -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the summary of investment holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Article 12 + Details
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