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Nature of Operations and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share Basic And Diluted [Abstract]
Net income (loss)	$ 507,650us-gaap_NetIncomeLoss	$ (2,193,017)us-gaap_NetIncomeLoss	$ 653,830us-gaap_NetIncomeLoss	$ (3,661,317)us-gaap_NetIncomeLoss
Weighted-average common shares outstanding - basic	30,697,391	30,453,455	30,657,308	30,427,646
Weighted-average common shares outstanding - diluted	31,321,259	30,453,455	31,241,374	30,427,646
Net income (loss) per share - Basic	$ 0.02us-gaap_EarningsPerShareBasic	$ (0.07)us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ (0.12)us-gaap_EarningsPerShareBasic
Net income (loss) per share - Diluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ (0.07)us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ (0.12)us-gaap_EarningsPerShareDiluted

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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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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