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Cash, Cash Equivalents and Marketable Securities | 9 Months Ended
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Sep. 30, 2016
Cash, Cash Equivalents and Marketable Securities | 6. Cash, Cash Equivalents and Marketable Securities At September 30, 2016, the Company’s investments included money market funds and short-term marketable securities. At December 31, 2015, the Company’s investments included money market funds, short-term and long-term marketable securities. These marketable securities are classified as available-for-sale. Marketable securities are investments with original maturities of greater than 90 days. Long-term marketable securities are securities with maturities of greater than one year. The average remaining contractual maturity of marketable securities at September 30, 2016 was approximately 6.1 months. Management reviewed the Company’s investments as of September 30, 2016 and December 31, 2015 and concluded that there are no securities with other than temporary impairments in the investment portfolio. The Company does not intend to sell any investments in an unrealized loss position, and it is not more likely than not that the Company will be required to sell the investments before recovery of their amortized cost bases. Investments in marketable securities consisted of the following at September 30, 2016 (in thousands):
|  | September 30, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 2,016 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 2,017 |
Corporate and other debt securities |  |  | 18,966 |  |  |  | 78 |  |  |  | (1 | ) |  |  | 19,043 |
Total |  | $ | 20,982 |  |  | $ | 79 |  |  | $ | (1 | ) |  | $ | 21,060 |
There were no long-term marketable securities as of September 30, 2016. At September 30, 2016, the Company’s investments included three securities in unrealized loss positions with a total unrealized loss of approximately $1,000 and a total fair market value of approximately $1,415,000. All investments with gross unrealized losses have been in unrealized loss positions for less than 12 months. The unrealized losses were caused primarily by current economic and market conditions. There was no change in the credit risk of the securities. There were no realized gains or losses on the investments for the nine months ended September 30, 2016 and 2015. Investments in marketable securities consisted of the following at December 31, 2015 (in thousands):
|  | December 31, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 7,029 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 7,023 |
Corporate and other debt securities |  |  | 10,659 |  |  |  | 7 |  |  |  | (7 | ) |  |  | 10,659 |
|  |  | 17,688 |  |  |  | 7 |  |  |  | (13 | ) |  |  | 17,682 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  |  | 838 |  |  |  | — |  |  |  | (2 | ) |  |  | 836 |
Corporate and other debt securities |  |  | 800 |  |  |  | — |  |  |  | (3 | ) |  |  | 797 |
|  |  | 1,638 |  |  |  | — |  |  |  | (5 | ) |  |  | 1,633 |
Total |  | $ | 19,326 |  |  | $ | 7 |  |  | $ | (18 | ) |  | $ | 19,315 |
The contractual maturities of all money market funds and marketable securities are less than one year as of September 30, 2016.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References No definition available. + Details
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