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Net Income (Loss) Per Share - Computation of Net Loss Per Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:        
Net income (loss) applicable to common stockholders $ (1,558) $ 3,310 $ (4,671) $ (2,355)
Denominator:        
Basic net income (loss) per Class A and Class B share applicable to common stockholders $ (0.04) $ 0.07 $ (0.11) $ (0.05)
Diluted net income (loss) per Class A and Class B share applicable to common stockholders $ (0.04) $ 0.07 $ (0.11) $ (0.05)
Class A        
Numerator:        
Net income (loss) applicable to common stockholders $ (167) $ 345 $ (502) $ (250)
Diluted net income (loss) applicable to common stockholders $ (167) $ 345 $ (502) $ (250)
Denominator:        
Weighted average number of shares outstanding used to calculate basic net income (loss) per share 4,661 4,661 4,661 4,661
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share 4,661 4,661 4,661 4,661
Basic net income (loss) per Class A and Class B share applicable to common stockholders $ (0.04) $ 0.07 $ (0.11) $ (0.05)
Diluted net income (loss) per Class A and Class B share applicable to common stockholders $ (0.04) $ 0.07 $ (0.11) $ (0.05)
Class B        
Numerator:        
Net income (loss) applicable to common stockholders $ (1,391) $ 2,965 $ (4,169) $ (2,105)
Reallocation of net income (loss) for Class A shares as a result of conversion of Class A to Class B shares (167) 345 (502) (250)
Diluted net income (loss) applicable to common stockholders $ (1,558) $ 3,310 $ (4,671) $ (2,355)
Denominator:        
Weighted average number of shares outstanding used to calculate basic net income (loss) per share 38,861 39,246 38,735 39,213
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 income (loss) per share 43,522 44,385 43,396 43,874
Weighted average stock options and common shares subject to repurchase or cancellation   478    
Basic net income (loss) per Class A and Class B share applicable to common stockholders $ (0.04) $ 0.07 $ (0.11) $ (0.05)
Diluted net income (loss) per Class A and Class B share applicable to common stockholders $ (0.04) $ 0.07 $ (0.11) $ (0.05)