Interim Financial Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Summary of selected quarterly financial information
Sales, net	$ 51,511	$ 50,370	$ 53,438	$ 52,859	$ 44,604	$ 36,212	$ 25,284	$ 20,083	$ 208,178	$ 126,183	$ 38,919
Gross profit	44,222	43,501	38,760	45,052	38,177	31,223	21,604	17,127	171,535	108,131	33,002
Net income (loss)	$ (182)	$ 3,416	$ 209	$ 4,165	$ 4,832	$ (4,846)	$ 8,759	$ 3,724	$ 7,608	$ 12,469	$ (50,792)
Per common share:
Basic	$ 0.00	$ 0.03	$ 0.00	$ 0.04	$ 0.04	$ (0.05)	$ 0.09	$ 0.04	$ 0.07	$ 0.12	$ (0.69)
Diluted	$ 0.00	$ 0.03	$ 0.00	$ 0.03	$ 0.04	$ (0.05)	$ 0.05	$ 0.02	$ 0.06	$ 0.11	$ (0.69)