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CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly statements of operations | RAMBUS INC. CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA Quarterly Statements of Operations (Unaudited)
| Dec. 31, 2017 |  | Sept. 30, 2017 |  | June 30, 2017 |  | March 31, 2017 |  | Dec. 31, 2016 |  | Sept. 30, 2016 |  | June 30, 2016 |  | March 31, 2016
| (In thousands, except for per share amounts)
Total revenue | $ | 101,891 |  |  | $ | 99,134 |  |  | $ | 94,720 |  |  | $ | 97,351 |  |  | $ | 97,559 |  |  | $ | 89,855 |  |  | $ | 76,501 |  |  | $ | 72,682 |
Total operating costs and expenses (1) | $ | 86,172 |  |  | $ | 82,124 |  |  | $ | 86,476 |  |  | $ | 83,917 |  |  | $ | 97,035 |  |  | $ | 78,039 |  |  | $ | 64,493 |  |  | $ | 63,388 |
Operating income | $ | 15,719 |  |  | $ | 17,010 |  |  | $ | 8,244 |  |  | $ | 13,434 |  |  | $ | 524 |  |  | $ | 11,816 |  |  | $ | 12,008 |  |  | $ | 9,294 |
Net income (loss) (2) | $ | (36,168 | ) |  | $ | 7,695 |  |  | $ | 2,605 |  |  | $ | 3,006 |  |  | $ | (3,445 | ) |  | $ | 4,511 |  |  | $ | 3,876 |  |  | $ | 1,878 |
Net income (loss) per share — basic | $ | (0.33 | ) |  | $ | 0.07 |  |  | $ | 0.02 |  |  | $ | 0.03 |  |  | $ | (0.03 | ) |  | $ | 0.04 |  |  | 0.04 |  |  | $ | 0.02 |
Net income (loss) per share — diluted | $ | (0.33 | ) |  | $ | 0.07 |  |  | $ | 0.02 |  |  | $ | 0.03 |  |  | $ | (0.03 | ) |  | $ | 0.04 |  |  | 0.03 |  |  | $ | 0.02 |
Shares used in per share calculations — basic (3) | 109,737 |  |  | 109,555 |  |  | 110,060 |  |  | 111,464 |  |  | 110,788 |  |  | 110,214 |  |  | 109,904 |  |  | 109,733 |
Shares used in per share calculations — diluted (3) | 109,737 |  |  | 113,119 |  |  | 112,565 |  |  | 115,325 |  |  | 110,788 |  |  | 113,723 |  |  | 112,061 |  |  | 112,252 |
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(1) | The quarterly financial information includes $18.3 million of impairment of in-process research and development intangible asset and a reduction of operating expenses due to the change in the contingent consideration liability of $6.8 million in the quarter ended December 31, 2016. Refer to Note 5, “Intangible Assets and Goodwill” of Notes to Consolidated Financial Statements of this Form 10-K.
(2) | The net loss for the quarter ended December 31, 2017 included a $21.5 million deferred tax asset valuation allowance and $20.7 million related to re-measurement of deferred tax assets as a result of the tax law changes. Refer to Note 16, "Income Taxes" of Notes to Consolidated Financial Statements of this Form 10-K.
(3) | The quarterly financial information includes the impact of the accelerated share repurchase program as follows: 0.8 million shares in the quarter ended December 31, 2017 and 3.2 million shares repurchased in the quarter ended June 30, 2017 and 0.7 million shares in the quarter ended June 30, 2016. Refer to Note 13, "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/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=84173487&loc=d3e1280-108306 + Details
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