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Available-for-sale Securities | 3 Months Ended
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Mar. 31, 2014
Available-for-sale Securities | Note 3. Available-for-sale Securities The following is a summary of available-for-sale securities at March 31, 2014 (in thousands):
|  | March 31, 2014 |
|  | Carrying Value |  |  | Gross Unrealized Gain |  |  | Fair Value |
Money market funds |  | $ | 9,648 |  |  | $ | 0 |  |  | $ | 9,648 |
Corporate debt securities |  |  | 20,243 |  |  |  | 8 |  |  |  | 20,251 |
United States government agency securities |  |  | 4,012 |  |  |  | 0 |  |  |  | 4,012 |
Total available-for-sale securities |  | $ | 33,903 |  |  | $ | 8 |  |  | $ | 33,911 |
The following is a summary of available-for-sale securities at December 31, 2013 (in thousands):
|  | December 31, 2013 |
|  | Carrying Value |  |  | Gross Unrealized Gain |  |  | Fair Value |
Money market funds |  | $ | 8,650 |  |  | $ | 0 |  |  | $ | 8,650 |
Corporate debt securities |  |  | 23,165 |  |  |  | 8 |  |  |  | 23,173 |
United States government agency securities |  |  | 5,019 |  |  |  | (1 | ) |  |  | 5,018 |
Total available-for-sale securities |  | $ | 36,834 |  |  | $ | 7 |  |  | $ | 36,841 |
Available-for-sale securities at March 31, 2014 and December 31, 2013 consisted of the following by original contractual maturity (in thousands):
|  | March 31, 2014 |  |  | December 31, 2013 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Due in one year or less |  | $ | 33,903 |  |  | $ | 33,911 |  |  | $ | 30,700 |  |  | $ | 30,701 |
Due greater than one year and less than three years |  |  | 0 |  |  |  | 0 |  |  |  | 6,134 |  |  |  | 6,140 |
Total cash equivalents and short-term investments |  | $ | 33,903 |  |  | $ | 33,911 |  |  | $ | 36,834 |  |  | $ | 36,841 |
The Company did not record any gross realized gains from the sale or maturity of available-for-sale investments during the three months ended March 31, 2014 and 2013. The Company did not record losses on investments experiencing an other-than-temporary decline in fair value nor did it record any gross realized losses from the sale or maturity of available-for-sale investments during the three months ended March 31, 2014 and 2013, respectively.

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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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