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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, 2022
Mar. 31, 2021
Numerator:    
Net income (loss) applicable to common stockholders $ (1,582) $ (5,332)
Class A    
Numerator:    
Net income (loss) applicable to common stockholders (170) (568)
Diluted net income (loss) applicable to common stockholders $ (170) $ (568)
Denominator:    
Weighted average number of shares outstanding used to calculate basic net income (loss) per share 4,661 4,661
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share 4,661 4,661
Basic net income (loss) per share applicable to common stockholders $ (0.04) $ (0.12)
Diluted net income (loss) per share applicable to common stockholders $ (0.04) $ (0.12)
Class B    
Numerator:    
Net income (loss) applicable to common stockholders $ (1,412) $ (4,764)
Reallocation of net income (loss) for Class A shares as a result of conversion of Class A to Class B shares (170) (568)
Diluted net income (loss) applicable to common stockholders $ (1,582) $ (5,332)
Denominator:    
Weighted average number of shares outstanding used to calculate basic net income (loss) per share 38,666 39,087
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 income (loss) per share 43,327 43,748
Basic net income (loss) per share applicable to common stockholders $ (0.04) $ (0.12)
Diluted net income (loss) per share applicable to common stockholders $ (0.04) $ (0.12)