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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ 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
Income Statement [Abstract]                      
Revenues $ 27,062 $ 25,301 $ 28,075 $ 30,884 $ 26,997 $ 24,687 $ 26,411 $ 28,429 $ 111,322 $ 106,524 $ 114,263
Cost of revenues 2,880 2,987 3,016 3,385 3,462 3,018 3,222 3,207 12,268 12,909 13,855
Gross profit 24,182 22,314 25,059 27,499 23,535 21,669 23,189 25,222 99,054 93,615 100,408
Operating expenses:                      
Sales and marketing 13,974 13,375 15,628 15,542 13,746 13,973 14,213 15,356 58,519 57,288 58,429
Product development 1,799 2,297 2,386 2,511 2,208 2,315 2,344 2,357 8,993 9,224 9,096
General and administrative 5,620 5,928 5,967 5,789 6,502 5,363 5,246 5,447 23,304 22,558 22,697
Total operating expenses 21,393 21,600 23,981 23,842 22,456 21,651 21,803 23,160 90,816 89,070 90,222
Income from continuing operations 2,789 714 1,078 3,657 1,079 18 1,386 2,062 8,238 4,545 10,186
Other income (loss), net (52) (91) 30 161 62 86 18 7 48 173 (187)
Income from continuing operations before income taxes 2,737 623 1,108 3,818 1,141 104 1,404 2,069 8,286 4,718 9,999
Income tax expense 1,173 505 631 1,316 466 680 771 1,209 3,625 3,126 3,992
Income from continuing operations 1,564 118 477 2,502 675 (576) 633 860 4,661 1,592 6,007
Income from discontinued operations, net of income taxes 0 0 0 0 0 0 54 1,884 0 1,938 624
Net income $ 1,564 $ 118 $ 477 $ 2,502 $ 675 $ (576) $ 687 $ 2,744 $ 4,661 $ 3,530 $ 6,631
Income per share—basic:                      
Continuing operations (in dollars per share) $ 0.13 $ 0.01 $ 0.04 $ 0.20 $ 0.05 $ (0.05) $ 0.05 $ 0.07 $ 0.38 $ 0.12 $ 0.43
Discontinued operation (in dollars per share) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.15 0.04
Net income per share, basic (in dollars per share) 0.13 0.01 0.04 0.20 0.05 (0.05) 0.05 0.21 0.38 0.27 0.47
Income per share—diluted:                      
Continuing operations (in dollars per share) 0.13 0.01 0.04 0.20 0.05 (0.05) 0.05 0.07 0.37 0.12 0.43
Discontinued operation (in dollars per share) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.00 0.15 0.04
Net income per share, diluted (in dollars per share) $ 0.13 $ 0.01 $ 0.04 $ 0.20 $ 0.05 $ (0.05) $ 0.05 $ 0.21 $ 0.37 $ 0.27 $ 0.47
Shares used in computing basic net income per share (in shares)                 12,323 12,882 13,997
Shares used in computing diluted net income per share (in shares)                 12,510 12,894 13,997