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Computation of Net Income Loss Per Share Basic and Diluted (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income (loss) from continuing operations $ 598 $ (490) $ 360 $ (767)
Dividends paid to participating securities   (123)   (262)
Class A
        
Numerator:        
Net income (loss) from continuing operations 133 (172) 87 (292)
Net income (loss) from continuing operations applicable to common stockholders 133 (172) 87 (292)
Discontinued operations, net of tax 196 (15) 207 (27)
Net income (loss) applicable to common stockholders, basic 329 (187) 294 (319)
Net income (loss) from continuing operations 129 (172) 87 (292)
Net income (loss) from continuing operations applicable to common stockholders 129 (172) 87 (292)
Diluted discontinued operations, net of tax 191 (15) 204 (27)
Diluted discontinued operations, net of tax 191 (15) 204 (27)
Net income (loss) applicable to common stockholders 320 (187) 291 (319)
Denominator:        
Weighted average number of shares outstanding used to calculate basic net income (loss) per share 8,377 9,570 9,168 9,576
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share 8,377 9,570 9,168 9,576
Basic net income (loss) per share:        
Net income (loss) from continuing operations applicable to common stockholders $ 0.02 $ (0.02) $ 0.01 $ (0.03)
Discontinued operations, net of tax $ 0.02 $ 0.00 $ 0.02 $ 0.00
Basic net income (loss) per share applicable to common stockholders $ 0.04 $ (0.02) $ 0.03 $ (0.03)
Diluted net income (loss) per share:        
Net income (loss) from continuing operations applicable to common stockholders $ 0.02 $ (0.02) $ 0.01 $ (0.03)
Discontinued operations, net of tax $ 0.02 $ 0.00 $ 0.02 $ 0.00
Diluted net income (loss) per share applicable to common stockholders $ 0.04 $ (0.02) $ 0.03 $ (0.03)
Class B
        
Numerator:        
Net income (loss) from continuing operations 465 (318) 273 (475)
Dividends paid to participating securities   (123)   (262)
Net income (loss) from continuing operations applicable to common stockholders 465 (441) 273 (737)
Discontinued operations, net of tax 687 (38) 645 (68)
Net income (loss) applicable to common stockholders, basic 1,152 (479) 918 (805)
Net income (loss) from continuing operations 469 (318) 273 (475)
Reallocation of diluted discontinued operations for Class A shares as a result of conversion of Class A to Class B shares 129 (172) 87 (292)
Net income (loss) from continuing operations applicable to common stockholders 598 (613) 360 (1,029)
Diluted discontinued operations, net of tax 692 (38) 648 (68)
Diluted discontinued operations, net of tax 883 (53) 852 (95)
Net income (loss) applicable to common stockholders 1,481 (666) 1,212 (1,124)
Denominator:        
Weighted average number of shares outstanding used to calculate basic net income (loss) per share 27,308 24,536 26,280 24,303
Weighted average stock options and warrants and common shares subject to repurchase or cancellation 1,592   923  
Conversion of Class A to Class B common shares outstanding 8,377 9,570 9,168 9,576
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share 37,277 34,106 36,371 33,879
Basic net income (loss) per share:        
Net income (loss) from continuing operations applicable to common stockholders $ 0.02 $ (0.02) $ 0.01 $ (0.03)
Discontinued operations, net of tax $ 0.02 $ 0.00 $ 0.02 $ 0.00
Basic net income (loss) per share applicable to common stockholders $ 0.04 $ (0.02) $ 0.03 $ (0.03)
Diluted net income (loss) per share:        
Net income (loss) from continuing operations applicable to common stockholders $ 0.02 $ (0.02) $ 0.01 $ (0.03)
Discontinued operations, net of tax $ 0.02 $ 0.00 $ 0.02 $ 0.00
Diluted net income (loss) per share applicable to common stockholders $ 0.04 $ (0.02) $ 0.03 $ (0.03)
Class B | Discontinued Operations
        
Numerator:        
Reallocation of diluted discontinued operations for Class A shares as a result of conversion of Class A to Class B shares $ 191 $ (15) $ 204 $ (27)