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Computation of Net Loss Per Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net income (loss) applicable to common stockholders $ 3,310 $ (3,665) $ (2,355) $ (33,048)
Class A        
Numerator:        
Net income (loss) from continuing operations, net of tax 343 (509) (250) (3,571)
Discontinued operations, net of tax   146   323
Net income (loss) applicable to common stockholders $ 343 $ (363) $ (250) $ (3,248)
Weighted average number of shares outstanding used to calculate basic net income (loss) per share 4,661 4,661 4,661 4,661
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share 4,661 4,661 4,661 4,661
Basic net income (loss) per share:        
Continuing operations, net of tax $ 0.07 $ (0.11) $ (0.05) $ (0.77)
Discontinued operations, net of tax   0.03   0.07
Basic net income (loss) per share applicable to common stockholders $ 0.07 $ (0.08) $ (0.05) $ (0.70)
Numerator:        
Net income (loss) from continuing operations, net of tax $ 345 $ (509) $ (250) $ (3,571)
Diluted net income (loss) from continuing operations, net of tax 345 (509) (250) (3,571)
Discontinued operations, net of tax   146   323
Diluted net income from discontinued operations, net of tax   146   323
Net income (loss) loss applicable to common stockholders $ 345 $ (363) $ (250) $ (3,248)
Diluted income (loss) per share:        
Continuing operations, net of tax $ 0.07 $ (0.11) $ (0.05) $ (0.77)
Discontinued operations, net of tax   0.03   0.07
Diluted net income (loss) per share applicable to common stockholders $ 0.07 $ (0.08) $ (0.05) $ (0.70)
Class B        
Numerator:        
Net income (loss) from continuing operations, net of tax $ 2,967 $ (4,634) $ (2,105) $ (32,758)
Discontinued operations, net of tax   1,333   2,958
Net income (loss) applicable to common stockholders $ 2,967 $ (3,301) $ (2,105) $ (29,800)
Weighted average number of shares outstanding used to calculate basic net income (loss) per share 39,246 42,470 39,213 42,333
Weighted average stock options and common shares subject to repurchase or cancellation 478      
Conversion of Class A to Class B common shares outstanding 4,661 4,661 4,661 4,661
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share 44,385 47,131 43,874 46,994
Basic net income (loss) per share:        
Continuing operations, net of tax $ 0.07 $ (0.11) $ (0.05) $ (0.77)
Discontinued operations, net of tax   0.03   0.07
Basic net income (loss) per share applicable to common stockholders $ 0.07 $ (0.08) $ (0.05) $ (0.70)
Numerator:        
Net income (loss) from continuing operations, net of tax $ 2,965 $ (4,634) $ (2,105) $ (32,758)
Reallocation of net income (loss) for Class A shares as a result of conversion of Class A to Class B shares 345 (509) (250) (3,571)
Diluted net income (loss) from continuing operations, net of tax 3,310 (5,143) (2,355) (36,329)
Discontinued operations, net of tax   1,333   2,958
Reallocation of discontinued operations for Class A shares as a result of conversion of Class A to Class B shares   146   323
Diluted net income from discontinued operations, net of tax   1,479   3,281
Net income (loss) loss applicable to common stockholders $ 3,310 $ (3,664) $ (2,355) $ (33,048)
Diluted income (loss) per share:        
Continuing operations, net of tax $ 0.07 $ (0.11) $ (0.05) $ (0.77)
Discontinued operations, net of tax   0.03   0.07
Diluted net income (loss) per share applicable to common stockholders $ 0.07 $ (0.08) $ (0.05) $ (0.70)