Fair Value Measurements & Derivative Instruments - Fair Value Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Dec. 31, 2012	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 30,011	$ 280,261
Contingent consideration	173,621	173,621
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	2,931,032	3,377,288
Marketable securities	56,008	106,500
Derivative assets		250,250
Derivative liabilities	1,490,584	647,213
Contingent consideration	173,621	173,621
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	2,931,032	3,377,288
Marketable securities	56,008	106,500
Derivative assets
Derivative liabilities
Contingent consideration
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents
Marketable securities
Derivative assets
Derivative liabilities
Contingent consideration
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents
Marketable securities
Derivative assets		250,250
Derivative liabilities	1,490,584	647,213
Contingent consideration	$ 173,621	$ 173,621