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Computation of Net Loss Per Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Numerator:    
Net income (loss) applicable to common stockholders $ (4,390) $ (38,446)
Class A    
Numerator:    
Net loss from continuing operations, net of tax (466) (4,233)
Discontinued operations, net of tax 0 360
Net income (loss) applicable to common stockholders (466) (3,873)
Diluted net loss from continuing operations, net of tax (466) (4,233)
Net income from discontinued operations, net of tax   360
Net loss applicable to common stockholders $ (466) $ (3,873)
Denominator:    
Weighted average number of shares outstanding used to calculate basic net loss per share 4,661 4,661
Weighted average number of shares outstanding used to calculate diluted net loss per share 4,661 4,661
Basic net income (loss) per share:    
Continuing operations, net of tax $ (0.10) $ (0.91)
Discontinued operations, net of tax   0.08
Basic net loss per share applicable to common stockholders (0.10) (0.83)
Diluted net loss per share:    
Continuing operations, net of tax (0.10) (0.91)
Discontinued operations, net of tax   0.08
Diluted net loss per share applicable to common stockholders $ (0.10) $ (0.83)
Class B    
Numerator:    
Net loss from continuing operations, net of tax $ (3,924) $ (37,785)
Discontinued operations, net of tax 0 3,212
Net income (loss) applicable to common stockholders (3,924) (34,573)
Reallocation of net income (loss) for Class A shares as a result of conversion of Class A to Class B shares (466) (4,233)
Diluted net loss from continuing operations, net of tax (4,390) (42,018)
Reallocation of discontinued operations for Class A shares as a result of conversion of Class A to Class B share   360
Net income from discontinued operations, net of tax   3,572
Net loss applicable to common stockholders $ (4,390) $ (38,446)
Denominator:    
Weighted average number of shares outstanding used to calculate basic net loss per share 39,256 41,599
Conversion of Class A to Class B common shares outstanding 4,661 4,661
Weighted average number of shares outstanding used to calculate diluted net loss per share 43,917 46,260
Basic net income (loss) per share:    
Continuing operations, net of tax $ (0.10) $ (0.91)
Discontinued operations, net of tax   0.08
Basic net loss per share applicable to common stockholders (0.10) (0.83)
Diluted net loss per share:    
Continuing operations, net of tax (0.10) (0.91)
Discontinued operations, net of tax   0.08
Diluted net loss per share applicable to common stockholders $ (0.10) $ (0.83)