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Marketable Securities | 12 Months Ended
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Dec. 31, 2018
Investments Debt And Equity Securities [Abstract] |
Marketable Securities | NOTE 3 – MARKETABLE SECURITIES The table below summarizes the Company’s cash equivalents and available-for-sale securities (in thousands):
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Fair Value |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 103,291 |  |  | $ | — |  |  | $ | — |  |  | $ | 103,291 |
Total |  |  | 103,291 |  |  |  | — |  |  |  | — |  |  |  | 103,291 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities |  |  | 177,353 |  |  |  | — |  |  |  | (129 | ) |  |  | 177,224 |
Corporate debt securities |  |  | 63,981 |  |  |  | — |  |  |  | (111 | ) |  |  | 63,870 |
U.S. government-sponsored entity debt securities |  |  | 18,640 |  |  |  | — |  |  |  | (19 | ) |  |  | 18,621 |
Total |  |  | 259,974 |  |  |  | — |  |  |  | (259 | ) |  |  | 259,715 |
Total cash equivalents and available-for-sale securities |  | $ | 363,265 |  |  | $ | — |  |  | $ | (259 | ) |  | $ | 363,006 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 24,290 |  |  | $ | — |  |  | $ | — |  |  | $ | 24,290 |
Commercial paper securities |  |  | 4,595 |  |  |  | — |  |  |  | — |  |  |  | 4,595 |
Total |  |  | 28,885 |  |  |  | — |  |  |  | — |  |  |  | 28,885 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities |  |  | 110,365 |  |  |  | — |  |  |  | (118 | ) |  |  | 110,247 |
Corporate debt securities |  |  | 75,886 |  |  |  | — |  |  |  | (131 | ) |  |  | 75,755 |
U.S. government-sponsored entity debt securities |  |  | 8,498 |  |  |  | — |  |  |  | (6 | ) |  |  | 8,492 |
Total |  |  | 194,749 |  |  |  | — |  |  |  | (255 | ) |  |  | 194,494 |
Total cash equivalents and available-for-sale securities |  | $ | 223,634 |  |  |  | — |  |  | $ | (255 | ) |  | $ | 223,379 |
As of December 31, 2018, all of the Company’s investments had maturity dates within one year as of the balance sheet date. The Company had no material realized losses from the sale of available-for-sale securities for the years ended December 31, 2018, 2017 or 2016. Sangamo has the intent and ability to hold its investments for a period of time sufficient to allow for any anticipated recovery in market value. No investments were other-than-temporarily impaired at either December 31, 2018 or 2017.

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