Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended						3 Months Ended			9 Months Ended		12 Months Ended
	May. 31, 2015	Mar. 31, 2015	Feb. 28, 2015	Oct. 31, 2014	Jul. 31, 2014	Jun. 30, 2014	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Mar. 12, 2015	Feb. 25, 2014
Public Offering Of Common Stock and Warrants [Line Items]
Net proceed from offering common stock and warrants										$ 13,316,324	$ 7,918,179
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized							$ 346,000			$ 346,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition										2 years 3 months 18 days
Preferred Stock, Par or Stated Value Per Share							$ 0.001			$ 0.001		$ 0.001
Preferred Stock Shares Outstanding							0			0		0
Return Of Capital To Common Shareholders Attributable From Repurchase Of Preferred Shares And Related Embedded Beneficial Conversion Features							$ 0		$ 0	$ 589,751	$ 0
2014 Management Incentive Compensation
Public Offering Of Common Stock and Warrants [Line Items]
Closing Price Of Shares													$ 1.69
2013 Management Incentive Compensation
Public Offering Of Common Stock and Warrants [Line Items]
Closing Price Of Shares														$ 2.45
Series A-3 convertible Preferred Stock
Public Offering Of Common Stock and Warrants [Line Items]
Stock issued during period, shares, other						2,621,859
Share price						$ 1,000
Stock Issued During Period, Shares, Conversion of Convertible Securities							1,285,225
Conversion of Stock, Shares Converted					2,417,859	204
Series A-4 convertible Preferred Stock
Public Offering Of Common Stock and Warrants [Line Items]
Stock issued during period, shares, other						4,022,357
Share price						$ 1,000
Stock Issued During Period, Shares, Conversion of Convertible Securities							1,971,744
Stock Repurchased During Period, Value	$ 3,200,000
Series B Preferred Stock
Public Offering Of Common Stock and Warrants [Line Items]
Conversion of Stock, Shares Converted							28,170	24,684
Preferred Stock Conversion Price Per Share	$ 1.0101
Preferred Stock Shares Outstanding							94,146			94,146
Series A4 Preferred Stock
Public Offering Of Common Stock and Warrants [Line Items]
Conversion of Stock, Shares Converted	3,206,357		408	408
Preferred Stock, Redemption Price Per Share	$ 1,000
Stock Repurchased During Period, Shares	3,206,357
Common Stock
Public Offering Of Common Stock and Warrants [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion	14,553,000		200,000	200,000	1,185,225	100,000	2,788,830	2,443,716		2,788,830
2014 Offering
Public Offering Of Common Stock and Warrants [Line Items]
Stock issued during period, shares, other						664,600
Share price						$ 2.04
Gross proceeds from issuance or sale of equity						$ 8,000,000
Class of warrant or right, Number of securities called by warrants or rights						3,921,569
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 2.04
Debt Instrument, Convertible, Beneficial Conversion Feature						$ 2,955,668
Preferred Stock, Par or Stated Value Per Share									$ 1,000		$ 1,000
Warrants and Rights Outstanding							$ 700,000			$ 700,000
Preferred Stock Conversion Price Per Share									2.04
Class of Warrant or Right, Outstanding							2,349,825			2,349,825
2014 Offering | Series A4 Preferred Stock
Public Offering Of Common Stock and Warrants [Line Items]
Net proceed from offering common stock and warrants						$ 7,900,000
Proceeds used to repurchase outstanding preferred shares	$ 3,200,000
2014 Offering | Warrants
Public Offering Of Common Stock and Warrants [Line Items]
Fair Value of Warrants							$ 4,400,000			$ 4,400,000
Exercise price							$ 2.04			$ 2.04
Expected volatility										67.48%
Risk free interest rate										1.64%
Share price									$ 2.00		$ 2.00
2013 Offering
Public Offering Of Common Stock and Warrants [Line Items]
Warrants and Rights Outstanding							$ 200,000			$ 200,000
Class of Warrant or Right, Outstanding							1,057,323			1,057,323
2015 Issuance | 2014 Management Incentive Compensation
Public Offering Of Common Stock and Warrants [Line Items]
Stock Issued During Period, Shares, New Issues		166,405
Stock Issued During Period, Value, New Issues		$ 281,700
2014 Issuance | 2013 Management Incentive Compensation
Public Offering Of Common Stock and Warrants [Line Items]
Stock Issued During Period, Shares, New Issues												42,615
Stock Issued During Period, Value, New Issues												$ 104,405
2015 Offering
Public Offering Of Common Stock and Warrants [Line Items]
Net proceed from offering common stock and warrants	10,100,000
Fair Value of Warrants							$ 3,200,000			$ 3,200,000
Gross proceeds from issuance or sale of equity	$ 14,700,000
Class of warrant or right, Number of securities called by warrants or rights	14,553,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1.25
Debt Instrument, Convertible, Beneficial Conversion Feature	$ 4,140,446
2015 Offering | Series B Preferred Stock
Public Offering Of Common Stock and Warrants [Line Items]
Share price	$ 100
Stock Issued During Period, Shares, New Issues	147,000
Preferred Stock, Par or Stated Value Per Share	$ 100