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Marketable Securities
 6 Months Ended
Jun. 30, 2022
Debt Securities, Available-for-sale [Abstract]  
Marketable Securities Marketable SecuritiesRambus 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.
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, 2022
(In thousands, except percentages)Fair Value
Amortized
 Cost
Gross
 Unrealized
 Gains
Gross
 Unrealized
 Losses
Weighted
 Rate of
 Return
Money market funds$65,706 $65,706 $— $— 1.32 %
U.S. Government bonds and notes62,622 64,512 — (1,890)0.37 %
Corporate notes, bonds and commercial paper126,527 129,017 — (2,490)0.58 %
Total cash equivalents and marketable securities254,855 259,235 — (4,380) 
Cash96,780 96,780 — —  
Total cash, cash equivalents and marketable securities$351,635 $356,015 $— $(4,380) 
 As of December 31, 2021
(In thousands, except percentages)Fair Value
Amortized
 Cost
Gross
 Unrealized
 Gains
Gross
 Unrealized
 Losses
Weighted
 Rate of
 Return
Money market funds$7,402 $7,402 $— $— 0.02 %
U.S. Government bonds and notes102,812 103,113 — (301)0.29 %
Corporate notes, bonds and commercial paper287,905 288,667 8 (770)0.22 %
Total cash equivalents and marketable securities398,119 399,182 8 (1,071) 
Cash87,490 87,490 — —  
Total cash, cash equivalents and marketable securities$485,609 $486,672 $8 $(1,071) 
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, 2022December 31, 2021
Cash equivalents$74,680 $20,401 
Short-term marketable securities180,175 377,718 
Total cash equivalents and marketable securities254,855 398,119 
Cash96,780 87,490 
Total cash, cash equivalents and marketable securities$351,635 $485,609 
The Company continues to invest in highly rated and highly liquid debt securities. 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 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, 2022 and December 31, 2021 are as follows:
 Fair ValueGross Unrealized Losses
(In thousands)June 30, 2022December 31, 2021June 30, 2022December 31, 2021
Less than 12 months    
U.S. Government bonds and notes$62,622 $82,822 $(1,890)$(301)
Corporate notes, bonds and commercial paper110,380 255,783 (1,916)(770)
Total cash equivalents and marketable securities in a continuous unrealized loss position for less than 12 months173,002 338,605 (3,806)(1,071)
12 months or greater
Corporate notes, bonds and commercial paper16,147 — (574)— 
Total cash equivalents and marketable securities in a continuous unrealized loss position for 12 months or greater16,147 — (574)— 
Total cash equivalents and marketable securities in a continuous unrealized loss position$189,149 $338,605 $(4,380)$(1,071)
The gross unrealized losses at June 30, 2022 and December 31, 2021 were not material in relation to the Company’s total available-for-sale portfolio. The gross unrealized losses 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. The Company reasonably believes that there is no need to sell these investments and 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 (loss). 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.
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, 2022
Due less than one year$119,546 
Due from one year through three years69,603 
Total$189,149 
Refer to Note 8, “Fair Value of Financial Instruments,” for discussion regarding the fair value of the Company’s cash equivalents and marketable securities.