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Marketable Securities | 6 Months Ended
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Jun. 30, 2018
Available-for-sale Securities [Abstract] |
Marketable Securities | Marketable Securities Rambus invests its excess cash and cash equivalents primarily in U.S. government-sponsored obligations, commercial paper, corporate notes and bonds, money market funds and municipal notes and bonds that mature within three years. As of June 30, 2018 and December 31, 2017, all of the Company’s cash equivalents and marketable securities had a remaining maturity of less than one year. All cash equivalents and marketable securities are classified as available-for-sale. Total cash, cash equivalents and marketable securities are summarized as follows:
|  | As of June 30, 2018
(In thousands) |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Weighted Rate of Return
Money market funds |  | $ | 11,078 |  |  | $ | 11,078 |  |  | $ | — |  |  | $ | — |  |  | 1.75 | %
U.S. Government bonds and notes |  | 68,898 |  |  | 68,897 |  |  | 1 |  |  | — |  |  | 1.74 | %
Corporate notes, bonds, commercial paper and other |  | 177,594 |  |  | 177,639 |  |  | — |  |  | (45 | ) |  | 1.90 | %
Total cash equivalents and marketable securities |  | 257,570 |  |  | 257,614 |  |  | 1 |  |  | (45 | ) |  |  |
Cash |  | 40,770 |  |  | 40,770 |  |  | — |  |  | — |  |  |  |
Total cash, cash equivalents and marketable securities |  | $ | 298,340 |  |  | $ | 298,384 |  |  | $ | 1 |  |  | $ | (45 | ) |  |  |
|  | As of December 31, 2017
(In thousands) |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Weighted Rate of Return
Money market funds |  | $ | 10,915 |  |  | $ | 10,915 |  |  | $ | — |  |  | $ | — |  |  | 1.16 | %
U.S. Government bonds and notes |  | 55,220 |  |  | 55,221 |  |  | — |  |  | (1 | ) |  | 1.12 | %
Corporate notes, bonds, commercial paper and other |  | 195,073 |  |  | 195,204 |  |  | — |  |  | (131 | ) |  | 1.39 | %
Total cash equivalents and marketable securities |  | 261,208 |  |  | 261,340 |  |  | — |  |  | (132 | ) |  |  |
Cash |  | 68,168 |  |  | 68,168 |  |  | — |  |  | — |  |  |  |
Total cash, cash equivalents and marketable securities |  | $ | 329,376 |  |  | $ | 329,508 |  |  | $ | — |  |  | $ | (132 | ) |  |  |
Available-for-sale securities are reported at fair value on the balance sheets and classified as follows:
| As of
| June 30, 2018 |  | December 31, 2017
| (In thousands)
Cash equivalents | $ | 207,514 |  |  | $ | 157,676 |
Short term marketable securities | 50,056 |  |  | 103,532 |
Total cash equivalents and marketable securities | 257,570 |  |  | 261,208 |
Cash | 40,770 |  |  | 68,168 |
Total cash, cash equivalents and marketable securities | $ | 298,340 |  |  | $ | 329,376 |
The Company continues to invest in highly rated quality, highly liquid debt securities. As of June 30, 2018, these securities have a remaining maturity of less than one year. The Company holds all of its marketable securities as available-for-sale, marks them to market, and regularly reviews its portfolio to ensure adherence to its investment policy and to monitor individual investments for risk analysis, proper valuation, and unrealized losses that may be other than temporary. The 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 at June 30, 2018 and December 31, 2017 are as follows:
| Fair Value |  | Gross Unrealized Loss
| June 30, 2018 |  | December 31, 2017 |  | June 30, 2018 |  | December 31, 2017
| (In thousands)
Less than one year |  |  |  |  |  |  |  |  |  |  |
U.S. Government bonds and notes | $ | 11,987 |  |  | $ | 42,581 |  |  | $ | — |  |  | $ | (1 | )
Corporate notes, bonds and commercial paper | 177,594 |  |  | 194,015 |  |  | (45 | ) |  | (131 | )
Total Corporate notes, bonds, and commercial paper and U.S. Government bonds and notes | $ | 189,581 |  |  | $ | 236,596 |  |  | $ | (45 | ) |  | $ | (132 | )
The gross unrealized loss at June 30, 2018 and December 31, 2017 was not material in relation to the Company’s total available-for-sale portfolio. The gross unrealized loss can be primarily attributed to a combination of market conditions as well as the demand for and duration of the U.S. government-sponsored obligations and corporate notes and bonds. There is no need to sell these investments, and the Company believes that it can recover the amortized cost of these investments. The Company has found no evidence of impairment due to credit losses in its portfolio. Therefore, these unrealized losses were recorded in other comprehensive income. However, the Company cannot provide any assurance that its portfolio of cash, cash equivalents and marketable securities will not be impacted by adverse conditions in the financial markets, which may require the Company in the future to record an impairment charge for credit losses which could adversely impact its financial results. See Note 8, “Fair Value of Financial Instruments,” for discussion regarding the fair value of the Company’s cash equivalents and marketable securities.

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- Definition The entire disclosure for cash, cash equivalents, investments in debt and equity instruments (including cost and equity investees and related income statement amounts), equity and cost method investments, investments in joint ventures and any other investment. + References No definition available. + Details
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