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Marketable Securities | 12 Months Ended
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Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities Included in marketable securities as of December 31, 2013 and 2012 are the following:
December 31, 2013 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 19,957 |  |  | $ | — |  |  | $ | — |  |  | $ | 19,957 |
Government agency bonds | 7,515 |  |  | — |  |  | (6 | ) |  | 7,509 |
United States treasuries | 8,035 |  |  | 6 |  |  | — |  |  | 8,041 |
Corporate notes | 8,457 |  |  |  |  | (4 | ) |  | 8,453 |
Certificates of deposit | 2,426 |  |  | — |  |  | — |  |  | 2,426 |
Total marketable securities designated as available for sale | $ | 46,390 |  |  | $ | 6 |  |  | $ | (10 | ) |  | $ | 46,386 |
December 31, 2012 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 9,921 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,921 |
Government agency bonds | 6,817 |  |  | 1 |  |  | — |  |  | 6,818 |
United States treasuries | 6,089 |  |  | — |  |  | — |  |  | 6,089 |
Corporate notes | 4,682 |  |  | — |  |  | (3 | ) |  | 4,679 |
Certificates of deposit | 1,800 |  |  | — |  |  | — |  |  | 1,800 |
Total marketable securities designated as available for sale | $ | 29,309 |  |  | $ | 1 |  |  | $ | (3 | ) |  | $ | 29,307 |
The amortized costs and fair value of debt securities as of December 31, 2013 and 2012 are shown below by effective maturity. Effective maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
December 31, 2013 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 31,023 |  |  | $ | 31,023 |
Due after one year and within two years | 15,367 |  |  | 15,363 |
| $ | 46,390 |  |  | $ | 46,386 |
December 31, 2012 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 22,485 |  |  | $ | 22,485 |
Due after one year and within two years | 6,824 |  |  | 6,822 |
| $ | 29,309 |  |  | $ | 29,307 |
No realized gains or losses were recognized on the Company’s marketable securities during the years ended December 31, 2013 and 2012.

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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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