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Marketable Securities | 6 Months Ended
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Jun. 30, 2013
Financial Instruments And Marketable Securities [Abstract] |
Marketable Securities | (2) Marketable Securities We follow a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) and the lowest priority to measurements involving unobservable inputs (Level 3). The three levels of the fair value hierarchy are as follows:
• | Level 1 inputs are observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
• | Level 2 inputs include other inputs that are directly or indirectly observable in the marketplace.
• | Level 3 inputs are unobservable inputs which are supported by little or no market activity.
The level in the fair value hierarchy within which a fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. The following table presents the placement in the fair value hierarchy of assets that are measured at fair value on a recurring basis:
June 30, 2013: | Total |  | Level 1 |  | Level 2 |  | Level 3
Common stock | $ | 437 |  |  | 437 |  |  | — |  |  | — |
Total available-for-sale securities | $ | 437 |  |  | 437 |  |  | — |  |  | — |
December 31, 2012: | Total |  | Level 1 |  | Level 2 |  | Level 3
Common stock | $ | 354 |  |  | 354 |  |  | — |  |  | — |
Total available-for-sale securities | $ | 354 |  |  | 354 |  |  | — |  |  | — |
June 30, 2012: | Total |  | Level 1 |  | Level 2 |  | Level 3
Common stock | $ | 310 |  |  | 310 |  |  | — |  |  | — |
Government and agency securities | 26,856 |  |  | 26,856 |  |  | — |  |  | — |
Total available-for-sale securities | $ | 27,166 |  |  | 27,166 |  |  | — |  |  | — |
There were no transfers between levels during the six and three month periods ended June 30, 2013 and 2012. As of June 30, 2013, December 31, 2012, and June 30, 2012, our financial assets that are measured at fair value on a recurring basis consisted of common stock and debt securities. Marketable securities, all treated as available-for-sale securities, consist of the following:
June 30, 2013: | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Common stock | $ | 197 |  |  | 240 |  |  | — |  |  | 437 |
Total available-for-sale securities | $ | 197 |  |  | 240 |  |  | — |  |  | 437 |
December 31, 2012: | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Common stock | $ | 197 |  |  | 157 |  |  | — |  |  | 354 |
Total available-for-sale securities | $ | 197 |  |  | 157 |  |  | — |  |  | 354 |
June 30, 2012: | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Common stock | $ | 197 |  |  | 113 |  |  | — |  |  | 310 |
Government and agency securities | 26,862 |  |  | — |  |  | (6 | ) |  | 26,856 |
Total available-for-sale securities | $ | 27,059 |  |  | 113 |  |  | (6 | ) |  | 27,166 |
The unrealized gains and losses recorded in accumulated other comprehensive income and the realized gains and losses recorded in earnings were immaterial during the periods reported in these consolidated financial statements. Future maturities of our available-for-sale securities consist of the following:
| Less than 12 months |  | Greater than 12 months
June 30, 2013: | Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
Common stock | $ | 197 |  |  | 437 |  |  | — |  |  | — |
Total available-for-sale securities | $ | 197 |  |  | 437 |  |  | — |  |  | — |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3, 19, 20, 21, 22, 137 -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 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 + Details
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