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Available-for-sale Securities (Tables) | 3 Months Ended
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Mar. 31, 2016
Summary of 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 Debt Securities by Original Contractual Maturity | 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 |
Available for Sale Marketable Securities in Unrealized Position | 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 | )

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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