Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Summary of Computation of Net Income or (Loss) Per Share (Details)

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Significant Accounting Policies - Summary of Computation of Net Income or (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:                      
Net income (loss) $ 63 $ (135) $ 662 $ 336 $ 1,275 $ 437 $ (3,190) $ (1,106) $ 926 $ (2,584) $ 1,141
Weighted average shares used in calculating income (loss) per share                      
Basic                 9,684 9,521 9,485
Diluted                 10,097 9,521 10,361
Net income (loss) per share:                      
Basic $ 0.01 $ (0.01) $ 0.07 $ 0.03 $ 0.13 $ 0.05 $ (0.34) $ (0.12) $ 0.10 $ (0.27) $ 0.12
Diluted $ 0.01 $ (0.01) $ 0.07 $ 0.03 $ 0.13 $ 0.04 $ (0.34) $ (0.12) $ 0.09 $ (0.27) $ 0.11