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Stock-Based Compensation - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | |||||||||||||||
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Dec. 31, 2013
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Sep. 30, 2013
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Sep. 30, 2012
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Jun. 18, 2013
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Dec. 31, 2013
Research and Development Expense
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Sep. 30, 2013
Research and Development Expense
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Dec. 31, 2013
General and Administrative Expense
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Sep. 30, 2013
General and Administrative Expense
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Dec. 31, 2013
Maximum
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Sep. 30, 2013
Maximum
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Dec. 31, 2013
Minimum
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Sep. 30, 2013
Minimum
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Sep. 30, 2013
Employees And Directors
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Dec. 31, 2013
Consultants
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Sep. 30, 2013
Consultants
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Sep. 30, 2013
Employees
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Sep. 30, 2013
Employees
Maximum
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Sep. 30, 2013
Employees
Minimum
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Sep. 30, 2013
Director
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Dec. 31, 2013
2013 Stock Incentive Plan
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Oct. 02, 2013
2013 Stock Incentive Plan
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Sep. 30, 2013
2013 Stock Incentive Plan
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Jun. 18, 2013
2013 Stock Incentive Plan
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Dec. 31, 2013
2013 Stock Incentive Plan
Consultants
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Sep. 30, 2013
2013 Stock Incentive Plan
Consultants
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Dec. 31, 2013
2013 Stock Incentive Plan
Consultants
Maximum
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Dec. 31, 2013
2013 Stock Incentive Plan
Consultants
Minimum
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Sep. 30, 2009
2009 Stock Incentive Plan
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Sep. 30, 2013
2009 Stock Incentive Plan
Consultants
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Sep. 30, 2013
2009 Stock Incentive Plan
Employees
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||||||||||||
| common stock, shares, issued | 60,145,237 | 60,145,237 | 5,645,212 | 7,825,388 | 707,460 | |||||||||||||||||||||||||
| Increase in aggregate number of shares | 3,000,000 | 2,405,809 | ||||||||||||||||||||||||||||
| Percentage Of Outstanding Number Of Shares | 4.00% | |||||||||||||||||||||||||||||
| Stock issued during period, shares, new issues | 1,900,000 | 1,100,000 | ||||||||||||||||||||||||||||
| Common stock shares subject to vesting issued | 579,026 | |||||||||||||||||||||||||||||
| Additional common stock shares subject to vesting issued | 116,973 | |||||||||||||||||||||||||||||
| Share-based compensation arrangement by share-based payment award, options, grants in period, gross | 220,000 | 3,000,000 | 220,000 | 1,400,000 | 500,000 | 1,100,000 | ||||||||||||||||||||||||
| Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term | 5 years | 4 years 10 months 17 days | 0 years | 10 years | 4 years 6 months | 4 years 6 months | 10 years | 3 years | ||||||||||||||||||||||
| Share-based compensation arrangement by share-based payment award, award vesting period | 3 years | 3 years | ||||||||||||||||||||||||||||
| Share-based compensation arrangements by share-based payment award, options, grants in period, weighted average exercise price | $ 0.20 | $ 0.38 | $ 0.40 | $ 0.37 | $ 0.37 | $ 0.40 | $ 0.20 | $ 0.19 | ||||||||||||||||||||||
| Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate, minimum | 113.00% | 76.57% | ||||||||||||||||||||||||||||
| Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate, maximum | 111.88% | |||||||||||||||||||||||||||||
| Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate, minimum | 2.80% | 0.88% | ||||||||||||||||||||||||||||
| Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate, maximum | 3.04% | 2.40% | ||||||||||||||||||||||||||||
| Share based compensation arrangement by share based payment award fair value assumptions expected forfeiture rate | 0.00% | 0.00% | ||||||||||||||||||||||||||||
| Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate | 0.00% | 0.00% | ||||||||||||||||||||||||||||
| Share-based compensation arrangement by share-based payment award, fair value assumptions, expected term | 10 years | 5 years 9 months | 9 years 8 months 12 days | 3 years | ||||||||||||||||||||||||||
| Share-based compensation arrangement by share-based payment award, number of shares available for grant | 7,011,197 | 4,825,388 | ||||||||||||||||||||||||||||
| Allocated share-based compensation expense | $ 131,563 | $ 288,000 | $ 85,999 | $ 38,000 | $ 45,564 | $ 250,000 | ||||||||||||||||||||||||
| Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, total | $ 915,000 | $ 996,000 | ||||||||||||||||||||||||||||
| Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition | 2 years 7 months 2 days | 2 years 9 months 11 days | ||||||||||||||||||||||||||||
| Common Stock, Shares Authorized | 300,000,000 | 300,000,000 | 75,000,000 | 10,231,197 | ||||||||||||||||||||||||||