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CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA (Unaudited) | 12 Months Ended
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Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |
CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA (Unaudited) | Supplementary Financial Data RAMBUS INC. CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA Quarterly Statements of Operations (Unaudited)
| Dec. 31, 2013 |  | Sept. 30, 2013 |  | June 30, 2013 |  | March 31, 2013 |  | Dec. 31, 2012 |  | Sept. 30, 2012 |  | June 30, 2012 |  | March 31, 2012
| (In thousands, except for per share amounts)
Total revenue | $ | 73,422 |  |  | $ | 73,294 |  |  | $ | 57,919 |  |  | $ | 66,866 |  |  | $ | 57,443 |  |  | $ | 57,530 |  |  | $ | 56,215 |  |  | $ | 62,863 |
Total operating costs and expenses (1) (2) | $ | 67,208 |  |  | $ | 64,229 |  |  | $ | 52,175 |  |  | $ | 65,425 |  |  | $ | 61,470 |  |  | $ | 104,630 |  |  | $ | 77,964 |  |  | $ | 80,421 |
Operating income (loss) | $ | 6,214 |  |  | $ | 9,065 |  |  | $ | 5,744 |  |  | $ | 1,441 |  |  | $ | (4,027 | ) |  | $ | (47,100 | ) |  | $ | (21,749 | ) |  | $ | (17,558 | )
Net loss | $ | (9,777 | ) |  | $ | (5,725 | ) |  | $ | (7,844 | ) |  | $ | (10,402 | ) |  | $ | (16,132 | ) |  | $ | (58,098 | ) |  | $ | (32,216 | ) |  | $ | (27,890 | )
Net loss per share — basic | $ | (0.09 | ) |  | $ | (0.05 | ) |  | $ | (0.07 | ) |  | $ | (0.09 | ) |  | $ | (0.14 | ) |  | $ | (0.52 | ) |  | (0.29 | ) |  | $ | (0.25 | )
Net loss per share — diluted | $ | (0.09 | ) |  | $ | (0.05 | ) |  | $ | (0.07 | ) |  | $ | (0.09 | ) |  | $ | (0.14 | ) |  | $ | (0.52 | ) |  | (0.29 | ) |  | $ | (0.25 | )
Shares used in per share calculations — basic | 113,217 |  |  | 112,640 |  |  | 112,183 |  |  | 111,599 |  |  | 111,332 |  |  | 110,826 |  |  | 110,553 |  |  | 110,358 |
Shares used in per share calculations — diluted | 113,217 |  |  | 112,640 |  |  | 112,183 |  |  | 111,599 |  |  | 111,332 |  |  | 110,826 |  |  | 110,553 |  |  | 110,358 |
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(1) | The quarterly financial information includes the following amounts related to the impairment of goodwill and long-lived assets as follows: $9.7 million in the quarter ended December 31, 2013, $8.1 million in the quarter ended September 30, 2013 and $35.5 million in the quarter ended September 30, 2012. Refer to Note 6, "Intangible Assets and Goodwill" of Notes to Consolidated Financial Statements of this Form 10-K.
(2) | The quarterly financial information includes the following amounts related to restructuring charges as follows: $2.2 million in the quarter ended December 31, 2013, $1.1 million in the quarter ended September 30, 2013, $2.2 million in the quarter ended March 31, 2013, $0.7 million in the quarter ended December 31, 2012, and $6.6 million in the quarter ended September 30, 2012. Refer to Note 16, "Restructuring Charges" of Notes to Consolidated Financial Statements of this Form 10-K.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 23, 24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 30 -Subparagraph a-j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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