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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Revenues $ 30,884 $ 28,429
Cost of revenues 3,385 3,207
Gross profit 27,499 25,222
Operating expenses:    
Sales and marketing 15,542 15,356
Product development 2,511 2,357
General and administrative 5,789 5,447
Total operating expenses 23,842 23,160
Income from continuing operations 3,657 2,062
Other income (loss), net 161 7
Income from continuing operations before income taxes 3,818 2,069
Income tax expense 1,316 1,209
Income from continuing operations 2,502 860
Income from discontinued operations, net of income taxes 0 1,884
Net income $ 2,502 $ 2,744
Income per share—basic:    
Continuing operations (in dollars per share) $ 0.20 $ 0.07
Discontinued operations (in dollars per share) 0.00 0.14
Net income per share - basic (in dollars per share) 0.20 0.21
Income per share—diluted:    
Continuing operations (in dollars per share) 0.20 0.07
Discontinued operations (in dollars per share) 0.00 0.14
Net income per share - diluted (in dollars per share) $ 0.20 $ 0.21
Shares used in computing basic net income per share (in shares) 12,462 13,288
Shares used in computing diluted net income per share (in shares) 12,462 13,288