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Interim Financial Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Summary of selected quarterly financial information
Revenue, net	$ 54,033	$ 50,562	$ 49,482	$ 49,127	$ 50,641	$ 45,007	$ 48,947	$ 54,894	$ 203,204	$ 199,489	$ 206,540
Gross profit	45,962	41,641	40,365	40,388	41,750	36,774	41,447	46,062	168,356	166,033	172,608
Net income	$ 2,992	$ 1,635	$ 317	$ 817	$ 84	$ 61	$ 283	$ 1,180	$ 5,761	$ 1,608	$ 6,106
Per common share:
Net income per share, basic (dollars per share)	$ 0.20	$ 0.12	$ 0.02	$ 0.06	$ 0.01	$ 0.00	$ 0.02	$ 0.09	$ 0.41	$ 0.12	$ 0.44
Net income per share, diluted (dollars per share)	$ 0.21	$ 0.12	$ 0.02	$ 0.06	$ 0.01	$ 0.00	$ 0.02	$ 0.08	$ 0.41	$ 0.11	$ 0.42

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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