XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Convertible Notes (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
Debt Disclosure [Abstract] |
Schedule of convertible notes | The Company’s convertible notes are shown in the following table:
(In thousands) |  | As of March 31, 2018 |  | As of December 31, 2017
2023 Notes |  | $ | 172,500 |  |  | $ | 172,500 |
2018 Notes |  | 81,207 |  |  | 81,207 |
Total principal amount of convertible notes |  | $ | 253,707 |  |  | $ | 253,707 |
Unamortized discount - 2023 Notes |  | (33,042 | ) |  | (34,506 | )
Unamortized discount - 2018 Notes |  | (1,540 | ) |  | (2,547 | )
Unamortized debt issuance costs - 2023 Notes |  | (2,422 | ) |  | (2,547 | )
Unamortized debt issuance costs - 2018 Notes |  | (125 | ) |  | (209 | )
Total convertible notes |  | $ | 216,578 |  |  | $ | 213,898 |
Less current portion |  | 79,541 |  |  | 78,451 |
Total long-term convertible notes |  | $ | 137,037 |  |  | $ | 135,447 |
Schedule of interest expense on notes | Interest expense related to the notes for the three months ended March 31, 2018 and 2017 was as follows:
| Three Months Ended
| March 31,
| 2018 |  | 2017
| (In thousands)
2023 Notes coupon interest at a rate of 1.375% | $ | 593 |  |  | $ | — |
2023 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 4.9% | 1,590 |  |  | — |
2018 Notes coupon interest at a rate of 1.125% | 53 |  |  | 388 |
2018 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 5.5% | 1,090 |  |  | 1,749 |
Total interest expense on convertible notes | $ | 3,326 |  |  | $ | 2,137 |

X
- Definition Tabular disclosure of the amounts of interest expense related to convertible notes during the reporting period. + References No definition available. + Details
Name: | rmbs_ScheduleOfInterestExpenseOnConvertibleSeniorNotesTableTextBlock
Namespace Prefix: | rmbs_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
Name: | us-gaap_ScheduleOfDebtTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration