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QUARTERLY SUPPLEMENTAL FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 (in thousands, except per share data):
|  | Three Months Ended |  |  |  |  |
|  | March 31, 2018 |  |  | June 30, 2018 |  |  | September 30, 2018 |  |  | December 31, 2018 |  |  | Total |
Revenue |  | $ | 43,572 |  |  | $ | 56,149 |  |  | $ | 77,550 |  |  | $ | 70,143 |  |  | $ | 247,414 |
Net income |  | $ | 5,959 |  |  | $ | 10,814 |  |  | $ | 22,818 |  |  | $ | 19,249 |  |  | $ | 58,840 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.13 |  |  | $ | 0.23 |  |  | $ | 0.48 |  |  | $ | 0.40 |  |  | $ | 1.24 |
Diluted |  | $ | 0.13 |  |  | $ | 0.23 |  |  | $ | 0.48 |  |  | $ | 0.40 |  |  | $ | 1.24 |
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) | Prior to the adoption of ASC 606 on January 1, 2018, the Company recorded as revenue the receipt of the semi-annual license fee payment of $45.0 million from SDC in the second and fourth quarters.
(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.

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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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