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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
Mar. 31, 2021
Mar. 31, 2020
Numerator:    
Net loss applicable to common stockholders $ (5,332) $ (24,875)
Class A    
Numerator:    
Net loss from continuing operations, net of tax (568) (2,539)
Discontinued operations, net of tax   64
Net loss applicable to common stockholders $ (568) $ (2,475)
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 loss per share:    
Continuing operations, net of tax $ (0.12) $ (0.54)
Discontinued operations, net of tax   0.01
Basic net loss per share applicable to common stockholders $ (0.12) $ (0.53)
Numerator:    
Net loss from continuing operations, net of tax $ (568) $ (2,539)
Diluted net loss from continuing operations, net of tax (568) (2,539)
Discontinued operations, net of tax   64
Diluted net income from discontinued operations, net of tax   64
Net loss applicable to common stockholders $ (568) $ (2,475)
Diluted loss per share:    
Continuing operations, net of tax $ (0.12) $ (0.54)
Discontinued operations, net of tax   0.01
Diluted net loss per share applicable to common stockholders $ (0.12) $ (0.53)
Class B    
Numerator:    
Net loss from continuing operations, net of tax $ (4,764) $ (22,984)
Discontinued operations, net of tax   584
Net loss applicable to common stockholders $ (4,764) $ (22,400)
Weighted average number of shares outstanding used to calculate basic net loss per share 39,087 42,179
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 43,748 46,840
Basic net loss per share:    
Continuing operations, net of tax $ (0.12) $ (0.54)
Discontinued operations, net of tax   0.01
Basic net loss per share applicable to common stockholders $ (0.12) $ (0.53)
Numerator:    
Net loss from continuing operations, net of tax $ (4,764) $ (22,984)
Reallocation of net loss for Class A shares as a result of conversion of Class A to Class B shares (568) (2,539)
Diluted net loss from continuing operations, net of tax (5,332) (25,523)
Discontinued operations, net of tax   584
Reallocation of discontinued operations for Class A shares as a result of conversion of Class A to Class B shares   64
Diluted net income from discontinued operations, net of tax   648
Net loss applicable to common stockholders $ (5,332) $ (24,875)
Diluted loss per share:    
Continuing operations, net of tax $ (0.12) $ (0.54)
Discontinued operations, net of tax   0.01
Diluted net loss per share applicable to common stockholders $ (0.12) $ (0.53)