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Net Income 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
Numerator:
Net income	$ (599)	$ 306	$ 1,328	$ 3,120	$ 1,564	$ 118	$ 477	$ 2,502	$ 4,155	$ 4,661
Denominator:
Weighted average common shares—basic (in shares)									11,809	12,323
Effect of dilutive securities: stock options (in shares)									226	187
Weighted average common shares—diluted (in shares)									12,035	12,510
Income per share—basic:
Net income per share, basic (in dollars per share)	$ (0.05)	$ 0.03	$ 0.11	$ 0.26	$ 0.13	$ 0.01	$ 0.04	$ 0.20	$ 0.35	$ 0.38
Income per share—diluted:
Net income per share, diluted (in dollars per share)	$ (0.05)	$ 0.03	$ 0.11	$ 0.26	$ 0.13	$ 0.01	$ 0.04	$ 0.20	$ 0.35	$ 0.37
Antidilutive securities excluded from computation of earnings per share (in shares)									200	200

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