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Unaudited Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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

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- Definition The aggregate total amount of expenses directly related to the marketing or selling of products or services. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration