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CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly statements of operations | RAMBUS INC. CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA Quarterly Statements of Operations (Unaudited)
| Dec. 31, 2019 |  | Sept. 30, 2019 |  | June 30, 2019 |  | March 31, 2019 |  | Dec. 31, 2018 |  | Sept. 30, 2018 |  | June 30, 2018 |  | March 31, 2018
| (In thousands, except for per share amounts)
Total revenue | $ | 59,947 |  |  | $ | 57,399 |  |  | $ | 58,297 |  |  | $ | 48,384 |  |  | $ | 68,563 |  |  | $ | 59,754 |  |  | $ | 56,458 |  |  | $ | 46,426 |
Total operating costs and expenses | $ | 73,158 |  |  | $ | 80,272 |  |  | $ | 95,343 |  |  | $ | 79,793 |  |  | $ | 72,763 |  |  | $ | 78,921 |  |  | $ | 76,445 |  |  | $ | 90,039 |
Operating loss | $ | (13,211 | ) |  | $ | (22,873 | ) |  | $ | (37,046 | ) |  | $ | (31,409 | ) |  | $ | (4,200 | ) |  | $ | (19,167 | ) |  | $ | (19,987 | ) |  | $ | (43,613 | )
Net loss (1) | $ | (9,532 | ) |  | $ | (17,331 | ) |  | $ | (36,980 | ) |  | $ | (26,576 | ) |  | $ | (2,018 | ) |  | $ | (104,893 | ) |  | $ | (15,357 | ) |  | $ | (35,689 | )
Net loss per share — basic | $ | (0.09 | ) |  | $ | (0.16 | ) |  | $ | (0.33 | ) |  | $ | (0.24 | ) |  | $ | (0.02 | ) |  | $ | (0.97 | ) |  | (0.14 | ) |  | $ | (0.33 | )
Net loss per share — diluted | $ | (0.09 | ) |  | $ | (0.16 | ) |  | $ | (0.33 | ) |  | $ | (0.24 | ) |  | $ | (0.02 | ) |  | $ | (0.97 | ) |  | (0.14 | ) |  | $ | (0.33 | )
Shares used in per share calculations — basic (2) | 111,883 |  |  | 111,315 |  |  | 110,875 |  |  | 109,692 |  |  | 108,826 |  |  | 107,897 |  |  | 107,737 |  |  | 109,358 |
Shares used in per share calculations — diluted (2) | 111,883 |  |  | 111,315 |  |  | 110,875 |  |  | 109,692 |  |  | 108,826 |  |  | 107,897 |  |  | 107,737 |  |  | 109,358 |
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(1) | The net loss for the quarter ended September 30, 2018 included a $91.3 million impact of an increase in our deferred tax asset valuation allowance. Refer to Note 19, “Income Taxes,” of Notes to Consolidated Financial Statements of this Form 10-K.
(2) The quarterly financial information includes the impact of the accelerated share repurchase program as follows: 0.7 million shares in the quarter ended June 30, 2018 and 3.1 million shares repurchased in the quarter ended March 31, 2018. Refer to Note 15, “Stockholders’ Equity,” of Notes to Consolidated Financial Statements of this Form 10-K.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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