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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Summary of Unaudited Quarterly Statements of Comprehensive Income Data | The following table presents our selected unaudited quarterly statements of comprehensive income data (in thousands, except per share amounts):
|  | For the Three Months Ended |
2018 |  | Mar 31 |  |  | Jun 30 |  |  | Sep 30 |  |  | Dec 31 |
Revenues |  | $ | 59,092 |  |  | $ | 61,091 |  |  | $ | 62,868 |  |  | $ | 65,189 |
Gross profit |  |  | 39,334 |  |  |  | 40,689 |  |  |  | 42,457 |  |  |  | 44,012 |
Income from operations |  |  | 4,300 |  |  |  | 5,965 |  |  |  | 8,257 |  |  |  | 8,209 |
Net income |  |  | 3,254 |  |  |  | 5,416 |  |  |  | 8,061 |  |  |  | 7,141 |
Diluted earnings per share |  | $ | 0.19 |  |  | $ | 0.31 |  |  | $ | 0.45 |  |  | $ | 0.40 |
|  | For the Three Months Ended |
2017 |  | Mar 31 |  |  | Jun 30 |  |  | Sep 30 |  |  | Dec 31 |
Revenues |  | $ | 51,879 |  |  | $ | 54,092 |  |  | $ | 56,057 |  |  | $ | 58,057 |
Gross profit |  |  | 34,549 |  |  |  | 35,901 |  |  |  | 37,412 |  |  |  | 38,598 |
Income from operations |  |  | 3,379 |  |  |  | 2,956 |  |  |  | 3,354 |  |  |  | 292 |
Net income (loss) |  |  | 2,985 |  |  |  | 1,968 |  |  |  | 2,176 |  |  |  | (6,778 | )
Diluted earnings per share |  | $ | 0.17 |  |  | $ | 0.11 |  |  | $ | 0.13 |  |  | $ | (0.39 | )

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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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