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QUARTERLY FINANCIAL INFORMATION (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Total revenue |  | $ 9,337 | $ 8,131 | $ 7,573 | $ 6,876 | $ 8,134 | $ 6,820 | $ 5,042 | $ 3,436 | $ 31,917 | $ 23,432
Less: cost of revenue and operating expenses |  | 6,457 | 5,311 | 4,858 | 4,921 | 4,542 | 3,885 | 3,108 | 2,953 | 21,547 | 14,488
Income from operations |  | 2,880 | 2,820 | 2,715 | 1,955 | 3,592 | 2,935 | 1,934 | 483 | 10,370 | 8,944
Income before income taxes |  | 2,880 | 2,819 | 2,678 | 1,840 | 3,348 | 2,244 | 1,540 | 362 |  |
Net income |  | $ 2,622 | $ 2,591 | $ 2,418 | $ 1,921 | $ 3,308 | $ 2,200 | $ 1,504 | $ 353 | $ 9,552 | $ 7,365
Net income per common share: |  |  |  |  |  |  |  |  |  |  |
Basic income per common share - net income | [1] | $ 0.08 | $ 0.08 | $ 0.07 | $ 0.06 | $ 0.10 | $ 0.07 | $ 0.05 | $ 0.01 |  |
Diluted income per common share - net income | [1] | $ 0.08 | $ 0.07 | $ 0.07 | $ 0.06 | $ 0.10 | $ 0.07 | $ 0.05 | $ 0.01 |  |
[1] | Sum of quarterly amounts may not equal year-to-date amounts due to rounding.

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