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CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly statements of operations | 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 Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: 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 + Details
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