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Earnings Per Share - Schedule of Computation of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Basic:                    
Net income (loss) $ 310 $ 6,314 $ (2,525) $ (3,580) $ (2,812) $ (4,144) $ (4,468) $ (6,726) $ 519 $ (18,150)
Shares used in computation:                    
Weighted-average common stock outstanding                 18,921 18,160
Basic earnings per share $ 0.02 $ 0.33 $ (0.13) $ (0.19)         $ 0.03 $ (1.00)
Diluted:                    
Net income (loss) $ 310 $ 6,314 $ (2,525) $ (3,580) $ (2,812) $ (4,144) $ (4,468) $ (6,726) $ 519 $ (18,150)
Weighted-average shares outstanding:                    
Weighted-average common stock outstanding                 18,921 18,160
Common stock equivalents                 384  
Weighted-average number of shares 19,603 19,737 18,837 18,482         19,305 18,160
Diluted earnings per share $ 0.02 $ 0.32 $ (0.13) $ (0.19)         $ 0.03 $ (1.00)