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Marketable Securities | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities Included in marketable securities as of December 31, 2015 and 2014 are the following:
December 31, 2015 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 13,244 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,244 |
United States treasuries | 1,002 |  |  | — |  |  | — |  |  | 1,002 |
Corporate notes | 2,283 |  |  | 1 |  |  | — |  |  | 2,284 |
Certificates of deposit | 6,089 |  |  | — |  |  | — |  |  | 6,089 |
Total marketable securities designated as available-for-sale | $ | 22,618 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 22,619 |
December 31, 2014 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 6,824 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,824 |
Government agency bonds | 3,505 |  |  | — |  |  | (3 | ) |  | 3,502 |
United States treasuries | 4,002 |  |  | 4 |  |  | — |  |  | 4,006 |
Corporate notes | 4,665 |  |  | 2 |  |  | — |  |  | 4,667 |
Certificates of deposit | 4,155 |  |  | — |  |  | — |  |  | 4,155 |
Municipal bonds | $ | 1,358 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1,359 |
Total marketable securities designated as available-for-sale | $ | 24,509 |  |  | $ | 7 |  |  | $ | (3 | ) |  | $ | 24,513 |
The amortized costs and fair value of debt securities as of December 31, 2015 and 2014 are shown below by effective maturity. Effective maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
December 31, 2015 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 5,515 |  |  | $ | 5,516 |
Due after one year and within two years | 3,859 |  |  | 3,859 |
| $ | 9,374 |  |  | $ | 9,375 |
December 31, 2014 | Amortized Cost |  | Fair Value
Due in less than one year | $ | 7,663 |  |  | $ | 7,668 |
Due after one year and within two years | 10,022 |  |  | 10,021 |
| $ | 17,685 |  |  | $ | 17,689 |
Interest income from marketable securities was $110 for the years ended December 31, 2015, and 2014, respectively.

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