Summary of Significant Accounting Policies - Additional Information (Details) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Significant Accounting Policies (Textual) [Abstract]
Sales	$ 68,288,000	$ 78,148,000	$ 76,420,000	$ 77,751,000	$ 36,949,000	$ 55,201,000	$ 56,233,000	$ 43,281,000	$ 300,607,000	$ 191,664,000	$ 172,970,000
Significant Accounting Policies (Additional Textual) [Abstract]
Minimum credit limit									30 days
Number of credit limit extended									60 days
Stock-based compensation expenses									500,000	800,000	700,000
Stock options granted during fiscal years
Shipping and handling costs									1,400,000	1,000,000	700,000
Patent amortization expense									100,000	200,000	200,000
Customer one
Significant Accounting Policies (Textual) [Abstract]
Percentage of trade accounts receivables									25.40%	17.70%
Percentage of company revenue									36.50%	17.70%	20.20%
Percentage of notes receivable									60.00%	60.40%
Customer two
Significant Accounting Policies (Textual) [Abstract]
Percentage of company revenue											11.10%
Percentage of notes receivable									39.10%	39.60%
Russian Subsidiary
Significant Accounting Policies (Textual) [Abstract]
Net working capital related to this subsidiary	7,100,000				6,300,000				7,100,000	6,300,000
Sales									$ 7,700,000	$ 4,100,000