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Net 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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net loss $ (2,956) $ (1,365) $ (10,203) $ (5,673)
Shares used in the calculation of basic and diluted net loss per share 19,284 16,700 18,049 16,652
Effect of dilutive securities:        
Diluted shares used in the calculation of net loss per share 19,284 16,700 18,049 16,652
Net loss per share - basic and diluted $ (0.15) $ (0.08) $ (0.57) $ (0.34)