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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
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net loss applicable to common stockholders $ (1,299) $ (926)
Numerator:    
Net loss applicable to common stockholders (1,299) (926)
Class A    
Numerator:    
Net loss applicable to common stockholders $ (146) $ (109)
Denominator:    
Weighted average number of shares outstanding used to calculate basic net loss per share 5,056 5,056
Weighted average number of shares outstanding used to calculate diluted net loss per share 5,056 5,056
Basic net loss per share applicable to common stockholders $ (0.03) $ (0.02)
Numerator:    
Net loss applicable to common stockholders $ (146) $ (109)
Diluted net loss applicable to common stockholders $ (146) $ (109)
Diluted net loss per share applicable to common stockholders $ (0.03) $ (0.02)
Class B    
Numerator:    
Net loss applicable to common stockholders $ (1,153) $ (817)
Denominator:    
Weighted average number of shares outstanding used to calculate basic net loss per share 39,827 38,039
Conversion of Class A to Class B common shares outstanding 5,056 5,056
Weighted average number of shares outstanding used to calculate diluted net loss per share 44,883 43,095
Basic net loss per share applicable to common stockholders $ (0.03) $ (0.02)
Numerator:    
Net loss applicable to common stockholders $ (1,153) $ (817)
Reallocation of net loss for Class A shares as a result of conversion of Class A to Class B shares (146) (109)
Diluted net loss applicable to common stockholders $ (1,299) $ (926)
Diluted net loss per share applicable to common stockholders $ (0.03) $ (0.02)