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Net Income (Loss) Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Numerator:        
Net income (loss) $ (543) $ 1,253 $ (862) $ 1,971
Dividends paid to participating securities (123) (66) (262) (191)
Denominator:        
Basic net income (loss) per share applicable to common stockholders $ (0.02) $ 0.04 $ (0.03) $ 0.05
Diluted net income (loss) per share applicable to common stockholders $ (0.02) $ 0.03 $ (0.03) $ 0.05
Class A [Member]
        
Numerator:        
Net income (loss) (187) 349 (319) 538
Net income (loss) applicable to common stockholders, basic (187) 349 (319) 538
Net income (loss) applicable to common stockholders, diluted (187) 325 (319) 507
Denominator:        
Weighted average number of shares outstanding used to calculate basic net income (loss) per share 9,570 9,851 9,576 10,027
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share 9,570 9,851 9,576 10,027
Basic net income (loss) per share applicable to common stockholders $ (0.02) $ 0.04 $ (0.03) $ 0.05
Diluted net income (loss) per share applicable to common stockholders $ (0.02) $ 0.03 $ (0.03) $ 0.05
Class B [Member]
        
Numerator:        
Net income (loss) (356) 904 (543) 1,433
Dividends paid to participating securities (123) (66) (262) (191)
Reallocation of net income (loss) for Class A shares as a result of conversion of Class A to Class B shares (187) 325 (319) 507
Net income (loss) applicable to common stockholders, basic (479) 838 (805) 1,242
Net income (loss) applicable to common stockholders, diluted $ (666) $ 1,187 $ (1,124) $ 1,780
Denominator:        
Weighted average number of shares outstanding used to calculate basic net income (loss) per share 24,536 23,673 24,303 23,136
Weighted average stock options and warrants and common shares subject to repurchase or cancellation   2,420   2,017
Conversion of Class A to Class B common shares outstanding 9,570 9,851 9,576 10,027
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share 34,106 35,944 33,879 35,180
Basic net income (loss) per share applicable to common stockholders $ (0.02) $ 0.04 $ (0.03) $ 0.05
Diluted net income (loss) per share applicable to common stockholders $ (0.02) $ 0.03 $ (0.03) $ 0.05