Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis and Fair Value Calculation Input Hierarchy Level (Detail) (USD $)	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 5,028,727	$ 2,672,711	$ 1,594,545	$ 2,112,254
Warrant derivative liability	185,000	314,000
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	5,028,727	2,672,711
Restricted cash	181,069	181,027
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant derivative liability	$ 185,000	$ 314,000