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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, 2020
Dec. 31, 2019
Numerator:    
Net loss applicable to common stockholders $ (38,446) $ (4,042)
Class A    
Numerator:    
Net loss from continuing operations, net of tax (4,233) (1,026)
Discontinued operations, net of tax 360 600
Net loss applicable to common stockholders (3,873) (426)
Diluted net loss from continuing operations, net of tax (4,233) (1,026)
Diluted net income from discontinued operations, net of tax 360 600
Net loss applicable to common stockholders $ (3,873) $ (426)
Denominator:    
Weighted average number of shares outstanding used to calculate basic net loss per share 4,661 4,793
Weighted average number of shares outstanding used to calculate diluted net loss per share 4,661 4,793
Basic net income (loss) per share:    
Continuing operations $ (0.91) $ (0.21)
Discontinued operations, net of tax 0.08 0.12
Basic net loss per share applicable to common stockholders (0.83) (0.09)
Diluted net loss per share:    
Continuing operations, net of tax (0.91) (0.21)
Discontinued operations, net of tax 0.08 0.12
Diluted net loss per share applicable to common stockholders $ (0.83) $ (0.09)
Class B    
Numerator:    
Net loss from continuing operations, net of tax $ (37,785) $ (8,706)
Discontinued operations, net of tax 3,212 5,090
Net loss applicable to common stockholders (34,573) (3,616)
Reallocation of net income (loss) for Class A shares as a result of conversion of Class A to Class B shares (4,233) (1,026)
Diluted net loss from continuing operations, net of tax (42,018) (9,732)
Reallocation of discontinued operations for Class A shares as a result of conversion of Class A to Class B share 360 600
Diluted net income from discontinued operations, net of tax 3,572 5,690
Net loss applicable to common stockholders $ (38,446) $ (4,042)
Denominator:    
Weighted average number of shares outstanding used to calculate basic net loss per share 41,599 40,667
Conversion of Class A to Class B common shares outstanding 4,661 4,793
Weighted average number of shares outstanding used to calculate diluted net loss per share 46,260 45,460
Basic net income (loss) per share:    
Continuing operations $ (0.91) $ (0.21)
Discontinued operations, net of tax 0.08 0.12
Basic net loss per share applicable to common stockholders (0.83) (0.09)
Diluted net loss per share:    
Continuing operations, net of tax (0.91) (0.21)
Discontinued operations, net of tax 0.08 0.12
Diluted net loss per share applicable to common stockholders $ (0.83) $ (0.09)