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Computation of Loss Per Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net loss applicable to common stockholders $ (3,665) $ (1,215) $ (33,048) $ (3,628)
Numerator:        
Net loss applicable to common stockholders (3,665) (1,215) (33,048) (3,628)
Class A        
Numerator:        
Net loss applicable to common stockholders $ (363) $ (124) $ (3,278) $ (387)
Denominator:        
Weighted average number of shares outstanding used to calculate basic net loss per share 4,661 4,661 4,661 4,838
Weighted average number of shares outstanding used to calculate diluted net loss per share 4,661 4,661 4,661 4,838
Basic net loss per share applicable to common stockholders $ (0.08) $ (0.03) $ (0.70) $ (0.08)
Numerator:        
Net loss applicable to common stockholders $ (363) $ (124) $ (3,278) $ (387)
Diluted net loss applicable to common stockholders $ (363) $ (124) $ (3,278) $ (387)
Diluted loss per share:        
Diluted net loss per share applicable to common stockholders $ (0.08) $ (0.03) $ (0.70) $ (0.08)
Class B        
Numerator:        
Net loss applicable to common stockholders $ (3,302) $ (1,091) $ (29,770) $ (3,241)
Denominator:        
Weighted average number of shares outstanding used to calculate basic net loss per share 42,470 40,984 42,333 40,459
Conversion of Class A to Class B common shares outstanding 4,661 4,661 4,661 4,838
Weighted average number of shares outstanding used to calculate diluted net loss per share 47,131 45,645 46,994 45,297
Basic net loss per share applicable to common stockholders $ (0.08) $ (0.03) $ (0.70) $ (0.08)
Numerator:        
Net loss applicable to common stockholders $ (3,302) $ (1,091) $ (29,770) $ (3,241)
Reallocation of net loss for Class A shares as a result of conversion of Class A to Class B shares (363) (124) (3,278) (387)
Diluted net loss applicable to common stockholders $ (3,665) $ (1,215) $ (33,048) $ (3,628)
Diluted loss per share:        
Diluted net loss per share applicable to common stockholders $ (0.08) $ (0.03) $ (0.70) $ (0.08)