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Marketable Securities | 3 Months Ended
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Mar. 31, 2019
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 |
March 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 15,233 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,233 |
Commercial paper securities |  |  | 4,990 |  |  |  | — |  |  |  | — |  |  |  | 4,990 |
Total |  |  | 20,223 |  |  |  | — |  |  |  | — |  |  |  | 20,223 |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities |  |  | 180,380 |  |  |  | 19 |  |  |  | — |  |  |  | 180,399 |
Corporate debt securities |  |  | 70,973 |  |  |  | — |  |  |  | (25 | ) |  |  | 70,948 |
U.S. government-sponsored entity debt securities |  |  | 18,681 |  |  |  | — |  |  |  | — |  |  |  | 18,681 |
Total |  |  | 270,034 |  |  |  | 19 |  |  |  | (25 | ) |  |  | 270,028 |
Total cash equivalents and available-for-sale securities |  | $ | 290,257 |  |  | $ | 19 |  |  | $ | (25 | ) |  | $ | 290,251 |
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 |
As of March 31, 2019 and 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 of its available-for-sale securities for the three months ended March 31, 2019 or 2018. 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 March 31, 2019 or December 31, 2018.

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