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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Securities, Available-for-sale, Sale [Abstract] |
Cash equivalents and marketable securities classified as available-for-sale | Total cash, cash equivalents and marketable securities are summarized as follows:
|  | As of June 30, 2021
(In thousands) |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Weighted Rate of Return
Money market funds |  | $ | 19,262 |  |  | $ | 19,262 |  |  | $ | — |  |  | $ | — |  |  | 0.03 | %
U.S. Government bonds and notes |  | 64,103 |  |  | 64,118 |  |  | 1 |  |  | (16) |  |  | 0.08 | %
Corporate notes, bonds and commercial paper |  | 208,279 |  |  | 208,407 |  |  | 12 |  |  | (140) |  |  | 0.20 | %
Total cash equivalents and marketable securities |  | 291,644 |  |  | 291,787 |  |  | 13 |  |  | (156) |  |  |
Cash |  | 185,469 |  |  | 185,469 |  |  | — |  |  | — |  |  |
Total cash, cash equivalents and marketable securities |  | $ | 477,113 |  |  | $ | 477,256 |  |  | $ | 13 |  |  | $ | (156) |  |  |
|  | As of December 31, 2020
(In thousands) |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Weighted Rate of Return
Money market funds |  | $ | 18,162 |  |  | $ | 18,162 |  |  | $ | — |  |  | $ | — |  |  | 0.01 | %
U.S. Government bonds and notes |  | 169,633 |  |  | 169,670 |  |  | 3 |  |  | (40) |  |  | 0.12 | %
Corporate notes, bonds and commercial paper |  | 253,391 |  |  | 253,412 |  |  | 61 |  |  | (82) |  |  | 0.20 | %
Total cash equivalents and marketable securities |  | 441,186 |  |  | 441,244 |  |  | 64 |  |  | (122) |  |  |
Cash |  | 61,463 |  |  | 61,463 |  |  | — |  |  | — |  |  |
Total cash, cash equivalents and marketable securities |  | $ | 502,649 |  |  | $ | 502,707 |  |  | $ | 64 |  |  | $ | (122) |  |  |
Available-for-sale securities reported at fair value | Available-for-sale securities are reported at fair value on the balance sheets and classified along with cash as follows:
|  | As of
(In thousands) |  | June 30, 2021 |  | December 31, 2020
Cash equivalents |  | $ | 19,262 |  |  | $ | 67,504 |
Short-term marketable securities |  | 272,382 |  |  | 373,682 |
Total cash equivalents and marketable securities |  | 291,644 |  |  | 441,186 |
Cash |  | 185,469 |  |  | 61,463 |
Total cash, cash equivalents and marketable securities |  | $ | 477,113 |  |  | $ | 502,649 |
Estimated fair value of cash equivalents and marketable securities classified by the length of time that the securities have been in a continuous unrealized loss position | The estimated fair value and gross unrealized losses of cash equivalents and marketable securities classified by the length of time that the securities have been in a continuous unrealized loss position at June 30, 2021 and December 31, 2020 are as follows:
|  | Fair Value |  | Gross Unrealized Losses
(In thousands) |  | June 30, 2021 |  | December 31, 2020 |  | June 30, 2021 |  | December 31, 2020
Less than 12 months |  |  |  |  |  |  |  |
U.S. Government bonds and notes |  | $ | 54,628 |  |  | $ | 70,548 |  |  | $ | (16) |  |  | $ | (40) |
Corporate notes, bonds and commercial paper |  | 149,777 |  |  | 181,349 |  |  | (140) |  |  | (82) |
Total cash equivalents and marketable securities in a continuous unrealized loss position |  | $ | 204,405 |  |  | $ | 251,897 |  |  | $ | (156) |  |  | $ | (122) |
Contractual maturities of cash equivalents (excluding money market funds which have no maturity) and marketable securities | The contractual maturities of cash equivalents (excluding money market funds which have no maturity) and marketable securities are summarized as follows:
(In thousands) |  | June 30, 2021
Due less than one year |  | $ | 196,592 |
Due from one year through three years |  | 75,790 |
Total |  | $ | 272,382 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 + Details
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