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Loss per Common Share - Calculation of Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net loss $ (1,365) $ (6,933) $ (5,673) $ (10,021)
Shares used in the calculation of basic and diluted net loss per share 16,700 16,424 16,652 16,291
Effect of dilutive securities:        
Diluted shares used in the calculation of net loss per share 16,700 16,424 16,652 16,291
Net loss per share-basic and diluted $ (0.08) $ (0.42) $ (0.34) $ (0.62)
Stock Options [Member]        
Effect of dilutive securities:        
Restricted stock 0 0 0 0
Restricted Stock [Member]        
Effect of dilutive securities:        
Restricted stock 0 0 0 0