Interim Financial Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Summary of selected quarterly financial information
Revenue, net	$ 53,033	$ 56,160	$ 51,995	$ 45,352	$ 45,301	$ 45,155	$ 48,247	$ 51,633	$ 206,540	$ 190,336	$ 213,968
Gross profit	43,632	46,446	44,153	38,377	38,008	37,603	40,761	45,954	172,608	162,326	180,774
Net income	$ 2,350	$ 1,003	$ 1,600	$ 1,066	$ 226	$ 573	$ 1,472	$ 4,716	$ 6,019	$ 6,987	$ 11,383
Per common share:
Income per share, basic (dollars per share)	$ 0.17	$ 0.07	$ 0.12	$ 0.08	$ 0.02	$ 0.04	$ 0.11	$ 0.33	$ 0.44	$ 0.50	$ 0.75
Income per share, diluted (dollars per share)	$ 0.16	$ 0.07	$ 0.11	$ 0.08	$ 0.02	$ 0.04	$ 0.10	$ 0.32	$ 0.41	$ 0.49	$ 0.71