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CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly statements of operations | RAMBUS INC. CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA Quarterly Statements of Operations (Unaudited)
(In thousands, except for per share amounts) |  | Dec. 31, 2020 |  | Sept. 30, 2020 |  | June 30, 2020 |  | March 31, 2020 |  | Dec. 31, 2019 |  | Sept. 30, 2019 |  | June 30, 2019 |  | March 31, 2019
Total revenue |  | $ | 61,913 |  |  | $ | 56,915 |  |  | $ | 59,930 |  |  | $ | 63,989 |  |  | $ | 59,947 |  |  | $ | 57,399 |  |  | $ | 58,297 |  |  | $ | 48,384 |
Total cost of revenue |  | $ | 13,451 |  |  | $ | 15,264 |  |  | $ | 16,148 |  |  | $ | 15,885 |  |  | $ | 14,576 |  |  | $ | 12,574 |  |  | $ | 13,027 |  |  | $ | 11,198 |
Gross profit |  | $ | 48,462 |  |  | $ | 41,651 |  |  | $ | 43,782 |  |  | $ | 48,104 |  |  | $ | 45,371 |  |  | $ | 44,825 |  |  | $ | 45,270 |  |  | $ | 37,186 |
Total operating expenses |  | $ | 59,466 |  |  | $ | 54,151 |  |  | $ | 56,246 |  |  | $ | 58,943 |  |  | $ | 58,582 |  |  | $ | 67,698 |  |  | $ | 82,316 |  |  | $ | 68,595 |
Operating loss |  | $ | (11,004) |  |  | $ | (12,500) |  |  | $ | (12,464) |  |  | $ | (10,839) |  |  | $ | (13,211) |  |  | $ | (22,873) |  |  | $ | (37,046) |  |  | $ | (31,409) |
Net loss |  | $ | (12,066) |  |  | $ | (12,779) |  |  | $ | (10,781) |  |  | $ | (7,983) |  |  | $ | (9,532) |  |  | $ | (17,331) |  |  | $ | (36,980) |  |  | $ | (26,576) |
Net loss per share — basic |  | $ | (0.11) |  |  | $ | (0.11) |  |  | $ | (0.09) |  |  | $ | (0.07) |  |  | $ | (0.09) |  |  | $ | (0.16) |  |  | (0.33) |  |  | $ | (0.24) |
Net loss per share — diluted |  | $ | (0.11) |  |  | $ | (0.11) |  |  | $ | (0.09) |  |  | $ | (0.07) |  |  | $ | (0.09) |  |  | $ | (0.16) |  |  | (0.33) |  |  | $ | (0.24) |
Shares used in per share calculations — basic |  | 112,706 |  |  | 113,828 |  |  | 113,572 |  |  | 112,907 |  |  | 111,883 |  |  | 111,315 |  |  | 110,875 |  |  | 109,692 |
Shares used in per share calculations — diluted |  | 112,706 |  |  | 113,828 |  |  | 113,572 |  |  | 112,907 |  |  | 111,883 |  |  | 111,315 |  |  | 110,875 |  |  | 109,692 |

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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=121640914&loc=d3e1280-108306 + Details
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