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QUARTERLY SUPPLEMENTAL FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Supplemental Financial Data (Unaudited) | Presented below is a summary of the unaudited quarterly financial information for the year ended December 31, 2017 (in thousands, except per share data):
|  | Three Months Ended |  |  |  |  |
|  | March 31, 2017 |  |  | June 30, 2017 (1) |  |  | September 30, 2017 |  |  | December 31, 2017 (1) (2) |  |  | Total |
Revenue |  | $ | 55,566 |  |  | $ | 102,513 |  |  | $ | 61,683 |  |  | $ | 115,867 |  |  | $ | 335,629 |
Net income |  | $ | 10,365 |  |  | $ | 47,187 |  |  | $ | 13,520 |  |  | $ | 32,813 |  |  | $ | 103,885 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.22 |  |  | $ | 0.99 |  |  | $ | 0.28 |  |  | $ | 0.70 |  |  | $ | 2.19 |
Diluted |  | $ | 0.22 |  |  | $ | 0.99 |  |  | $ | 0.28 |  |  | $ | 0.69 |  |  | $ | 2.18 |
(1) | The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.
(2) | The enactment of the Tax Cuts and Jobs Act in December 2017 resulted in a one-time charge of $11.5 million in the fourth quarter; see Note 18 for further details.
Presented below is a summary of the unaudited quarterly financial information for the year ended December 31, 2016 (in thousands, except per share data):
|  | Three Months Ended |  |  |  |  |
|  | March 31, 2016 |  |  | June 30, 2016 (1) |  |  | September 30, 2016 |  |  | December 31, 2016 (1) |  |  | Total |
Revenue |  | $ | 29,703 |  |  | $ | 64,392 |  |  | $ | 30,214 |  |  | $ | 74,577 |  |  | $ | 198,886 |
Net income (loss) |  | $ | 1,949 |  |  | $ | 21,802 |  |  | $ | (1,500 | ) |  | $ | 25,819 |  |  | $ | 48,070 |
Basic |  | $ | 0.04 |  |  | $ | 0.46 |  |  | $ | (0.03 | ) |  | $ | 0.55 |  |  | $ | 1.02 |
Diluted |  | $ | 0.04 |  |  | $ | 0.46 |  |  | $ | (0.03 | ) |  | $ | 0.55 |  |  | $ | 1.02 |
(1) | The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.

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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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