Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Additional Information (Detail)

Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			12 Months Ended											1 Months Ended						12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 18, 2013	Sep. 30, 2014 Research and Development Expense	Sep. 30, 2013 Research and Development Expense	Sep. 30, 2014 General and Administrative Expense	Sep. 30, 2013 General and Administrative Expense	Sep. 30, 2014 Maximum	Sep. 30, 2014 Minimum	Sep. 30, 2014 Employees And Directors	Sep. 30, 2014 Consultants	Sep. 30, 2014 Employees	Sep. 30, 2014 Employees Maximum	Sep. 30, 2014 Employees Minimum	Oct. 01, 2014 2013 Stock Incentive Plan	Oct. 31, 2013 2013 Stock Incentive Plan	Oct. 02, 2014 2013 Stock Incentive Plan	Sep. 30, 2014 2013 Stock Incentive Plan	Oct. 02, 2013 2013 Stock Incentive Plan	Jun. 18, 2013 2013 Stock Incentive Plan	Sep. 30, 2014 2013 Stock Incentive Plan Consultants Maximum	Sep. 30, 2014 2013 Stock Incentive Plan Consultants Minimum	Sep. 30, 2009 2009 Stock Incentive Plan	Sep. 30, 2014 2009 Stock Incentive Plan Consultants	Sep. 30, 2014 2009 Stock Incentive Plan Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
common stock, shares, issued	72,076,487	60,145,237																		7,825,388			707,460
Increase In Aggregate Number Of Shares			3,000,000
Percentage of outstanding number of shares			4.00%
Share-based compensation arrangement by share-based payment award, options, grants in period, gross	5,869,212										2,465,000	3,404,212
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term	5 years 5 months 16 days																				10 years	3 years
Share-based compensation arrangement by share-based payment award, award vesting period																					3 years	1 year
Share-based compensation arrangements by share-based payment award, options, grants in period, weighted average exercise price	$ 0.33												$ 0.37	$ 0.17
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate, minimum	77.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate, maximum	134.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate, minimum	0.83%
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate, maximum	2.52%
Share based compensation arrangement by share based payment award fair value assumptions expected forfeiture rate	0.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate	0.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected term								10 years	2 years 4 months 24 days
Share-based compensation arrangement by share-based payment award, number of shares available for grant	1,361,985
Allocated share-based compensation expense	$ 1,101,000	$ 288,000		$ 629,000	$ 38,000	$ 472,000	$ 250,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, total																		965,000
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition	2 years 11 days
Common Stock, Shares Authorized	300,000,000	300,000,000															13,114,256		10,231,197
Share-based compensation arrangement by share-based payment award, number of additional shares authorized															2,883,059	2,405,809
Stock Issued During Period, Shares, New Issues										5,304,212	3,565,000
Common Stock Shares Subject To Vesting Issued																									579,026
Additional Common Stock Shares Subject To Vesting Issued																								116,973
Restricted Stock or Unit Expense	$ 95,000	$ 0