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Cash and Marketable Securities | 6 Months Ended
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Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Cash and Marketable Securities | CASH AND MARKETABLE SECURITIES Cash, Cash Equivalents and Restricted Cash A reconciliation of cash, cash equivalents and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts reported within the accompanying Condensed Consolidated Statements of Cash Flows was as follows (in thousands):
| June 30, 2019 |  | December 31, 2018 |  | June 30, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 169,222 |  |  | $ | 140,418 |  |  | $ | 59,406 |  |  | $ | 49,826 |
Restricted cash included in Restricted cash, current portion | 2,000 |  |  | — |  |  | — |  |  | — |
Restricted cash included in Non-current restricted cash | 1,500 |  |  | 3,500 |  |  | 3,500 |  |  | 3,500 |
Cash, cash equivalents and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows | $ | 172,722 |  |  | $ | 143,918 |  |  | $ | 62,906 |  |  | $ | 53,326 |
Restricted cash consists of a letter of credit for $3.5 million established as a deposit for the Brisbane lease. Cash Equivalents and Available-for-sale 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
June 30, 2019 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 71,490 |  |  | $ | — |  |  | $ | — |  |  | $ | 71,490 |
Commercial paper securities |  | 30,439 |  |  | 2 |  |  | — |  |  | 30,441 |
Total |  | 101,929 |  |  | 2 |  |  | — |  |  | 101,931 |
Available-for-sale securities: |  |  |  |  |  |  |  |
Commercial paper securities |  | 170,598 |  |  | 355 |  |  | — |  |  | 170,953 |
Corporate debt securities |  | 71,280 |  |  | 108 |  |  | (5 | ) |  | 71,383 |
U.S. government-sponsored entity debt securities |  | 37,973 |  |  | 18 |  |  | — |  |  | 37,991 |
Total |  | 279,851 |  |  | 481 |  |  | (5 | ) |  | 280,327 |
Total cash equivalents and available-for-sale securities |  | $ | 381,780 |  |  | $ | 483 |  |  | $ | (5 | ) |  | $ | 382,258 |
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):
|  | June 30, 2019 |  | December 31, 2018
Maturing in one year or less |  | $ | 271,877 |  |  | $ | 259,715 |
Maturing after one year through five years |  | 8,450 |  |  | — |
Total |  | $ | 280,327 |  |  | $ | 259,715 |
The Company had no material realized losses of its available-for-sale securities for the three and six months ended June 30, 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 June 30, 2019 or December 31, 2018.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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