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Marketable Securities | 9 Months Ended
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Sep. 30, 2013
Marketable Securities [Abstract] |
Marketable Securities | Note 3—Marketable Securities The following is a summary of marketable securities:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 401 |  |  | $ | — |  |  | $ | — |  |  | $ | 401 |
December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 10,500 |  |  | $ | 35 |  |  | $ | (50 | ) |  | $ | 10,485 |
Proceeds from maturities and sale of available-for-sale securities were $3.5 million and $10.0 million in the three and nine months ended September 30, 2013, respectively. There were no maturities or sales of available-for-sale securities in the three and nine months ended September 30, 2012. There were no realized gains or losses from sales of available-for-sale securities in the three and nine months ended September 30, 2013 and 2012. The Company uses the specific identification method in computing the gross realized gains and gross realized losses on the sales of marketable securities. The contractual maturities of the Company’s available-for-sale corporate debt securities at September 30, 2013 were as follows:
|  | Fair Value |
|  | (in thousands) |
Within one year |  | $ | 401 |
After one year through five years |  |  | — |
After five years through ten years |  |  | — |
After ten years |  |  | — |
Total |  | $ | 401 |
The following available-for-sale securities were in an unrealized loss position for which other-than-temporary impairments had not been recognized:
|  | Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
December 31, 2012: |  |  |  |  |  |
Corporate debt securities |  | $ | 50 |  |  | $ | 2,500 |
At December 31, 2012, there were no securities in a continuous unrealized loss position for 12 months or longer.

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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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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=27724398&loc=d3e27357-111563 Reference 3: 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 4: 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 5: 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=27724398&loc=d3e27232-111563 Reference 6: 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 7: 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=27724398&loc=d3e27161-111563 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=27724398&loc=d3e27405-111563 Reference 9: 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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