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Available-for-sale Securities | 9 Months Ended
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Sep. 30, 2015
Available-for-sale Securities | Note 3. Available-for-sale Securities The following is a summary of available-for-sale securities at September 30, 2015 (in thousands):
|  | September 30, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Money market funds |  | $ | 42,169 |  |  | $ | — |  |  | $ | — |  |  | $ | 42,169 |
United States government agency securities |  |  | 30,000 |  |  |  | 3 |  |  |  | — |  |  |  | 30,003 |
Corporate debt securities |  |  | 18,973 |  |  |  | 3 |  |  |  | (11 | ) |  |  | 18,965 |
Aduro equity securities |  |  | — |  |  |  | 7,684 |  |  |  | — |  |  |  | 7,684 |
Total available-for-sale securities |  | $ | 91,142 |  |  | $ | 7,690 |  |  | $ | (11 | ) |  | $ | 98,821 |
The following is a summary of available-for-sale securities at December 31, 2014 (in thousands):
|  | December 31, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Loss |  |  | Fair Value |
Money market funds |  | $ | 3,912 |  |  | $ | — |  |  | $ | 3,912 |
United States government agency securities |  |  | 3,427 |  |  |  | (1 | ) |  |  | 3,426 |
Corporate debt securities |  |  | 26,118 |  |  |  | (30 | ) |  |  | 26,088 |
Total available-for-sale securities |  | $ | 33,457 |  |  | $ | (31 | ) |  | $ | 33,426 |
Available-for-sale debt securities at September 30, 2015 and December 31, 2014, consisted of the following by original contractual maturity (in thousands):
|  | September 30, 2015 |  |  | December 31, 2014 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
One year or less |  | $ | 91,142 |  |  | $ | 91,137 |  |  | $ | 27,752 |  |  | $ | 27,727 |
Greater than one year and less than five years |  |  | — |  |  |  | — |  |  |  | 5,705 |  |  |  | 5,699 |
Total available-for-sale debt securities |  | $ | 91,142 |  |  | $ | 91,137 |  |  | $ | 33,457 |  |  | $ | 33,426 |
As of September 30, 2015, the Company considered the declines in market value of its marketable securities investment portfolio to be temporary in nature and did not consider any of its investments other-than-temporarily impaired. Fair values were determined for each individual security in the investment portfolio. When evaluating an investment for other-than-temporary impairment, the Company reviews factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, changes in market interest rates, and the Company’s intent to sell, or whether it is more likely than not it will be required to sell, the investment before recovery of the investment’s cost basis. During the three and nine months ended September 30, 2015 and 2014, the Company did not recognize any other-than-temporary impairment losses. The Company did not record any gross realized gains from the sale or maturity of available-for-sale securities during the three months ended September 30, 2015 and recorded minimal gross realized gains from the sale or maturity of available-for-sale securities during the nine months ended September 30, 2015. The Company recorded minimal gross realized gains from the sale or maturity of available-for-sale securities during the three and nine months ended September 30, 2014. The Company did not record any gross realized losses from the sale or maturity of available-for-sale securities during the three and nine months ended September 30, 2015 and 2014.

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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 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: 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 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 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 5: 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 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 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 9: 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 + Details
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