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v3.10.0.1

General - Audited Consolidated Statement of Operations (Detail) - 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 | Dec. 31, 2016
Revenues | $ 65,189 | $ 62,868 | $ 61,091 | $ 59,092 | $ 58,057 | $ 56,057 | $ 54,092 | $ 51,879 | $ 248,240 | $ 220,085 | $ 193,153
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | 71,719 | 71,261 | 66,876
Income from operations | 8,209 | 8,257 | 5,965 | 4,300 | 292 | 3,354 | 2,956 | 3,379 | 26,731 | 9,981 | 6,385
Income tax expense |  |  |  |  |  |  |  |  | 4,468 | 10,342 | 2,755
Net income (loss) | $ 7,141 | $ 8,061 | $ 5,416 | $ 3,254 | $ (6,778) | $ 2,176 | $ 1,968 | $ 2,985 | $ 23,872 | $ 351 | $ 4,963
Net income per share |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  | $ 1.39 | $ 0.02 | $ 0.29
Diluted | $ 0.40 | $ 0.45 | $ 0.31 | $ 0.19 | $ (0.39) | $ 0.13 | $ 0.11 | $ 0.17 | $ 1.36 | $ 0.02 | $ 0.29
ASU 2014-09 [Member] | As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 220,566 | $ 193,295
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  | 73,295 | 65,886
Income from operations |  |  |  |  |  |  |  |  |  | 8,428 | 7,517
Income tax expense |  |  |  |  |  |  |  |  |  | 11,580 | 3,140
Net income (loss) |  |  |  |  |  |  |  |  |  | $ (2,440) | $ 5,710
Net income per share |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  | $ (0.14) | $ 0.34
Diluted |  |  |  |  |  |  |  |  |  | $ (0.14) | $ 0.33
ASU 2014-09 [Member] | Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ (481) | $ (142)
Operating expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  | (2,034) | 990
Income from operations |  |  |  |  |  |  |  |  |  | 1,553 | (1,132)
Income tax expense |  |  |  |  |  |  |  |  |  | (1,238) | (385)
Net income (loss) |  |  |  |  |  |  |  |  |  | $ 2,791 | $ (747)
Net income per share |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  | $ 0.16 | $ (0.05)
Diluted |  |  |  |  |  |  |  |  |  | $ 0.16 | $ (0.04)

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