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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net loss applicable to common stockholders $ (333) $ (4,508) $ (5,668) $ (29,383)
Class A        
Numerator:        
Net loss from continuing operations, net of tax (35) (561) (603) (3,090)
Discontinued operations, net of tax   114   179
Net loss applicable to common stockholders $ (35) $ (447) $ (603) $ (2,911)
Weighted average number of shares outstanding used to calculate basic net loss per share 4,661 4,661 4,661 4,661
Weighted average number of shares outstanding used to calculate diluted net loss per share 4,661 4,661 4,661 4,661
Basic net loss per share:        
Continuing operations, net of tax $ (0.01) $ (0.12) $ (0.13) $ (0.66)
Discontinued operations, net of tax   0.03   0.04
Basic net loss per share applicable to common stockholders $ (0.01) $ (0.09) $ (0.13) $ (0.62)
Numerator:        
Net loss from continuing operations, net of tax $ (35) $ (561) $ (603) $ (3,090)
Diluted net loss from continuing operations, net of tax (35) (561) (603) (3,090)
Discontinued operations, net of tax   114   179
Diluted net income from discontinued operations, net of tax   114   179
Net loss applicable to common stockholders $ (35) $ (447) $ (603) $ (2,911)
Diluted loss per share:        
Continuing operations, net of tax $ (0.01) $ (0.12) $ (0.13) $ (0.66)
Discontinued operations, net of tax   0.03   0.04
Diluted net loss per share applicable to common stockholders $ (0.01) $ (0.09) $ (0.13) $ (0.62)
Class B        
Numerator:        
Net loss from continuing operations, net of tax $ (298) $ (5,102) $ (5,065) $ (28,096)
Discontinued operations, net of tax   1,041   1,624
Net loss applicable to common stockholders $ (298) $ (4,061) $ (5,065) $ (26,472)
Weighted average number of shares outstanding used to calculate basic net loss per share 39,171 42,385 39,167 42,382
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 loss per share 43,832 47,046 43,828 47,043
Basic net loss per share:        
Continuing operations, net of tax $ (0.01) $ (0.12) $ (0.13) $ (0.66)
Discontinued operations, net of tax   0.03   0.04
Basic net loss per share applicable to common stockholders $ (0.01) $ (0.09) $ (0.13) $ (0.62)
Numerator:        
Net loss from continuing operations, net of tax $ (298) $ (5,102) $ (5,065) $ (28,096)
Reallocation of net loss for Class A shares as a result of conversion of Class A to Class B shares (35) (561) (603) (3,090)
Diluted net loss from continuing operations, net of tax (333) (5,663) (5,668) (31,186)
Discontinued operations, net of tax   1,041   1,624
Reallocation of discontinued operations for Class A shares as a result of conversion of Class A to Class B shares   114   179
Diluted net income from discontinued operations, net of tax   1,155   1,803
Net loss applicable to common stockholders $ (333) $ (4,508) $ (5,668) $ (29,383)
Diluted loss per share:        
Continuing operations, net of tax $ (0.01) $ (0.12) $ (0.13) $ (0.66)
Discontinued operations, net of tax   0.03   0.04
Diluted net loss per share applicable to common stockholders $ (0.01) $ (0.09) $ (0.13) $ (0.62)