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Marketable Securities | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | MARKETABLE SECURITIES The table below summarizes the Company’s cash equivalents and available-for-sale securities (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
December 31, 2019 |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 30,496 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,496 |
Commercial paper securities | 2,998 |  |  | 1 |  |  | — |  |  | 2,999 |
Total | 33,494 |  |  | 1 |  |  | — |  |  | 33,495 |
Available-for-sale securities: |  |  |  |  |  |  |
Commercial paper securities | 155,230 |  |  | 145 |  |  | (7) |  |  | 155,368 |
Corporate debt securities | 94,905 |  |  | 115 |  |  | (3) |  |  | 95,017 |
U.S. government-sponsored entity debt securities | 53,411 |  |  | 91 |  |  | (9) |  |  | 53,493 |
Total | 303,546 |  |  | 351 |  |  | (19) |  |  | 303,878 |
Total cash equivalents and available-for-sale securities | $ | 337,040 |  |  | $ | 352 |  |  | $ | (19) |  |  | $ | 337,373 |
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 |
The fair value of investments available-for-sale by contractual maturity were as follows (in thousands):
| December 31, |  |
| 2019 |  |  | 2018
Maturing in one year or less | $ | 282,046 |  |  |  | $ | 259,715 |
Maturing after one year through five years | 21,832 |  |  |  | — |
Total investments available-for-sale | $ | 303,878 |  |  |  | $ | 259,715 |
The Company had no material realized losses from the sale of available-for-sale securities for the years ended December 31, 2019, 2018 or 2017. 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, 2019 or 2018.

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