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Available-for-sale Securities | 3 Months Ended
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Mar. 31, 2016
Available-for-sale Securities | Note 3. Available-for-sale Securities The following is a summary of available-for-sale securities at March 31, 2016 (in thousands):
|  | March 31, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Money market funds |  | $ | 6,648 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,648 |
United States government agency securities |  |  | 9,996 |  |  |  | 1 |  |  |  | — |  |  |  | 9,997 |
Corporate debt securities |  |  | 60,465 |  |  |  | 72 |  |  |  | (21 | ) |  |  | 60,516 |
Marketable equity securities |  |  | — |  |  |  | 5,082 |  |  |  | — |  |  |  | 5,082 |
Total available-for-sale securities |  | $ | 77,109 |  |  | $ | 5,155 |  |  | $ | (21 | ) |  | $ | 82,243 |
The following is a summary of available-for-sale securities at December 31, 2015 (in thousands):
|  | December 31, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Money market funds |  | $ | 59,302 |  |  | $ | — |  |  | $ | — |  |  | $ | 59,302 |
Corporate debt securities |  |  | 25,747 |  |  |  | — |  |  |  | (49 | ) |  |  | 25,698 |
Marketable equity securities |  |  | — |  |  |  | 11,163 |  |  |  | — |  |  |  | 11,163 |
Total available-for-sale securities |  | $ | 85,049 |  |  | $ | 11,163 |  |  | $ | (49 | ) |  | $ | 96,163 |
Available-for-sale securities at March 31, 2016 and December 31, 2015, consisted of the following by contractual maturity (in thousands):
|  | March 31, 2016 |  |  | December 31, 2015 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
One year or less |  | $ | 56,934 |  |  | $ | 56,934 |  |  | $ | 85,049 |  |  | $ | 85,000 |
Marketable equity securities |  |  | — |  |  |  | 5,082 |  |  |  | — |  |  |  | 11,163 |
Greater than one year and less than five years |  |  | 20,175 |  |  |  | 20,227 |  |  |  | — |  |  |  | — |
Total available-for-sale securities |  | $ | 77,109 |  |  | $ | 82,243 |  |  | $ | 85,049 |  |  | $ | 96,163 |
The following tables show all available-for-sale marketable securities in an unrealized loss position for which an other-than-temporary impairment has not been recognized and the related gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
|  | March 31, 2016 |
|  | Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Corporate debt securities |  | $ | 18,137 |  |  | $ | (21 | ) |  | $ | — |  |  | $ | — |  |  | $ | 18,137 |  |  | $ | (21 | )
Total available-for-sale securities |  | $ | 18,137 |  |  | $ | (21 | ) |  | $ | — |  |  | $ | — |  |  | $ | 18,137 |  |  | $ | (21 | )
|  | December 31, 2015 |
|  | Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Corporate debt securities |  | $ | 20,170 |  |  | $ | (46 | ) |  | $ | 5,528 |  |  | $ | (3 | ) |  | $ | 25,698 |  |  | $ | (49 | )
Total available-for-sale securities |  | $ | 20,170 |  |  | $ | (46 | ) |  | $ | 5,528 |  |  | $ | (3 | ) |  | $ | 25,698 |  |  | $ | (49 | )
As of March 31, 2016, 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. The Company typically invests in highly-rated securities, and its investment policy limits the amount of credit exposure to any one issuer. The policy generally requires investments to be investment grade, with the primary objective of minimizing the potential risk of principal loss. 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 months ended March 31, 2016 and 2015, the Company did not recognize any other-than-temporary impairment loss. The Company has no current requirement or intent to sell the securities in an unrealized loss position. The Company expects to recover up to (or beyond) the initial cost of investment for securities held. 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, 2016 and 2015. The Company did not record any gross realized losses from the sale or maturity of available-for-sale investments during the three months ended March 31, 2016 and 2015.

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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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