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Quarterly Results of Operations (unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Results of Operations (unaudited) |
Quarterly Results of Operations (unaudited) | Note 19. Quarterly Results of Operations (unaudited)
|  | Dec. 31, |  | Sept. 30, |  | June 30, |  | March 31, |  | Dec. 31, |  | Sept. 30, |  | June 30, |  | March 31, |
|  | 2018 |  | 2018 |  | 2018 |  | 2018 |  | 2017(1) |  | 2017 |  | 2017 |  | 2017 |
|  | (in thousands, except per share data) |
Revenue |  | $ | 105,683 |  | $ | 95,374 |  | $ | 119,333 |  | $ | 122,185 |  | $ | 116,396 |  | $ | 104,482 |  | $ | 102,790 |  | $ | 86,893 |
Gross profit |  |  | 43,567 |  |  | 39,913 |  |  | 49,000 |  |  | 47,156 |  |  | 36,720 |  |  | 39,751 |  |  | 39,062 |  |  | 34,714 |
Net income |  |  | 8,463 |  |  | 8,838 |  |  | 14,669 |  |  | 13,915 |  |  | 91,680 |  |  | 11,841 |  |  | 13,932 |  |  | 9,506 |
Net income per basic share |  | $ | 0.26 |  | $ | 0.27 |  | $ | 0.46 |  | $ | 0.43 |  | $ | 2.88 |  | $ | 0.38 |  | $ | 0.46 |  | $ | 0.32 |
Net income per diluted share |  | $ | 0.25 |  | $ | 0.26 |  | $ | 0.43 |  | $ | 0.41 |  | $ | 2.68 |  | $ | 0.35 |  | $ | 0.42 |  | $ | 0.29 |
| (1) |  | For the quarter ending December 31, 2017, gross profit and net income includes a $6.2 million charge to inventory reserves. Net income also includes an $81.6 million tax benefit relating to the reversal of a valuation allowance on deferred tax assets.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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