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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ 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
Accounting Policies [Abstract]
Basic shares									6,386,946	6,276,670
Dilutive shares									412,800	377,951
Diluted shares									6,799,746	6,654,621
Net income									$ 4,566	$ 2,490
Basic net income per share	$ 0.19	$ 0.17	$ 0.16	$ 0.19	$ 0.23	$ 0.04	$ 0.06	$ 0.07	$ 0.71	$ 0.40
Diluted net income per share	$ 0.18	$ 0.16	$ 0.15	$ 0.18	$ 0.22	$ 0.03	$ 0.06	$ 0.06	$ 0.67	$ 0.37

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