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Available-for-sale Securities (Tables) | 6 Months Ended
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Jun. 30, 2015
Summary of Available for Sale Securities | The following is a summary of available-for-sale securities at June 30, 2015 (in thousands):
|  | June 30, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Money market funds |  | $ | 18,588 |  |  | $ | — |  |  | $ | — |  |  | $ | 18,588 |
United States government agency securities |  |  | 61,995 |  |  |  | 9 |  |  |  | — |  |  |  | 62,004 |
Corporate debt securities |  |  | 13,858 |  |  |  | — |  |  |  | (8 | ) |  |  | 13,850 |
Aduro equity securities |  |  | — |  |  |  | 12,032 |  |  |  | — |  |  |  | 12,032 |
Total available-for-sale securities |  | $ | 94,441 |  |  | $ | 12,041 |  |  | $ | (8 | ) |  | $ | 106,474 |
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 by Original Contractual Maturity | Available-for-sale debt securities at June 30, 2015 and December 31, 2014, consisted of the following by original contractual maturity (in thousands):
|  | June 30, 2015 |  |  | December 31, 2014 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
One year or less |  | $ | 94,441 |  |  | $ | 94,442 |  |  | $ | 27,752 |  |  | $ | 27,727 |
Greater than one year and less than five years |  |  | — |  |  |  | — |  |  |  | 5,705 |  |  |  | 5,699 |
Total available-for-sale debt securities |  | $ | 94,441 |  |  | $ | 94,442 |  |  | $ | 33,457 |  |  | $ | 33,426 |

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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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