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Marketable Securities | 9 Months Ended
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Sep. 30, 2014
Investments Debt And Equity Securities [Abstract] |
Marketable Securities | NOTE 3—MARKETABLE SECURITIES Sangamo generally classifies its marketable securities as available-for-sale and records its investments at fair value. Available-for-sale securities are carried at estimated fair value, with the unrealized holding gains and losses included in accumulated other comprehensive income. Investments that have maturities beyond one year as of the end of the reporting period are classified as non-current. The Company’s investments are subject to a periodic impairment review, and the Company recognizes an impairment charge when a decline in the fair value of its investments below the cost basis is judged to be other-than-temporary. The Company considers various factors in determining whether to recognize an impairment charge, including the length of time and extent to which the fair value has been less than the Company’s cost basis, the financial condition and near-term prospects of the investee, and the Company’s intent and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in the market value. The table below summarizes the Company’s investments (in thousands):
|  |  |  |  | Gross |  |  | Gross |  |  |  |  |
| Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
| Cost |  |  | Gains |  |  | (Losses) |  |  | Fair Value |
September 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 7,193 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,193 |
Total |  | 7,193 |  |  |  | — |  |  |  | — |  |  |  | 7,193 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities | $ | 36,195 |  |  | $ | 53 |  |  | $ | — |  |  | $ | 36,248 |
Corporate debt securities |  | 20,621 |  |  |  | — |  |  |  | (11 | ) |  |  | 20,610 |
U.S. government sponsored entity debt securities |  | 163,399 |  |  |  | 11 |  |  |  | — |  |  |  | 163,410 |
Total |  | 220,215 |  |  |  | 64 |  |  |  | (11 | ) |  |  | 220,268 |
Total cash equivalents and available-for-sale securities | $ | 227,408 |  |  | $ | 64 |  |  | $ | (11 | ) |  | $ | 227,461 |
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 6,934 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,934 |
Total |  | 6,934 |  |  |  | — |  |  |  | — |  |  |  | 6,934 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government sponsored entity debt securities |  | 121,278 |  |  |  | 12 |  |  |  | — |  |  |  | 121,290 |
Total cash equivalents and available-for-sale securities | $ | 128,212 |  |  | $ | 12 |  |  | $ | — |  |  | $ | 128,224 |
The Company had no other-than-temporary impairments of its investments for the three and nine months ended September 30, 2014 or the twelve months ended December 31, 2013.

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