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Unaudited Quarterly Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 26,997 $ 24,687 $ 26,411 $ 28,429 $ 26,814 $ 26,823 $ 29,798 $ 30,828 $ 106,524 $ 114,263 $ 123,961
Cost of revenues 3,462 3,018 3,222 3,207 3,263 3,270 3,471 3,851 12,909 13,855 18,148
Gross profit 23,535 21,669 23,189 25,222 23,551 23,553 26,327 26,977 93,615 100,408 105,813
Operating expenses:                      
Sales and marketing 13,746 13,973 14,213 15,356 13,369 14,075 15,455 15,530 57,288 58,429 65,609
Product development 2,208 2,315 2,344 2,357 2,077 2,230 2,001 2,788 9,224 9,096 12,214
General and administrative 6,502 5,363 5,246 5,447 6,077 5,373 5,434 5,813 22,558 22,697 24,170
Total operating expenses 22,456 21,651 21,803 23,160 21,523 21,678 22,890 24,131 89,070 90,222 101,993
Income from continuing operations 1,079 18 1,386 2,062 2,028 1,875 3,437 2,846 4,545 10,186 3,820
Other income (loss), net 62 86 18 7 (480) 251 (91) 133 173 (187) (1,242)
Income from continuing operations before income taxes 1,141 104 1,404 2,069 1,548 2,126 3,346 2,979 4,718 9,999 2,578
Income tax expense (benefit) 466 680 771 1,209 542 748 1,548 1,154 3,126 3,992 (5,945)
Income from continuing operations 675 (576) 633 860 1,006 1,378 1,798 1,825 1,592 6,007 8,523
Income from discontinued operations, net of income taxes 0 0 54 1,884 (63) 241 222 224 1,938 624 2,341
Net income $ 675 $ (576) $ 687 $ 2,744 $ 943 $ 1,619 $ 2,020 $ 2,049 $ 3,530 $ 6,631 $ 10,864
Income per share—basic:                      
Continuing operations (in dollars per share) $ 0.05 $ (0.05) $ 0.05 $ 0.07 $ 0.07 $ 0.10 $ 0.13 $ 0.13 $ 0.12 $ 0.43 $ 0.58
Discontinued operation (in dollars per share) 0.00 0.00 0.00 0.14 0.00 0.02 0.01 0.01 0.15 0.04 0.16
Net income per share, basic (in dollars per share) 0.05 (0.05) 0.05 0.21 0.07 0.12 0.14 0.14 0.27 0.47 0.74
Income per share—diluted:                      
Continuing operations (in dollars per share) 0.05 (0.05) 0.05 0.07 0.07 0.10 0.13 0.13 0.12 0.43 0.58
Discontinued operation (in dollars per share) 0.00 0.00 0.00 0.14 0.00 0.02 0.01 0.01 0.15 0.04 0.16
Net income per share, diluted (in dollars per share) $ 0.05 $ (0.05) $ 0.05 $ 0.21 $ 0.07 $ 0.12 $ 0.14 $ 0.14 $ 0.27 $ 0.47 $ 0.74