Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Oct. 09, 2015	Dec. 31, 2014	Nov. 13, 2014
Sale Of Stock [Line Items]
Common stock, shares issued		7,085,504		7,085,504			6,112,091
Proceeds from issuance of common stock, net				$ 4,626,373	$ 42,875
Legal, Accounting and Filing Fees				$ 138,000
Common stock, shares outstanding		7,085,504		7,085,504			6,112,091
Payroll withholdings from employees		$ 170,000		$ 170,000
Common stock for Employment Stock Purchase Plan				41,176
Stock options granted during period, shares		0	0
Unrecognized compensation costs		$ 2,700,000		$ 2,700,000
Weighted average period				1 year 2 months 19 days
Sales Agreement with MLV & Co. LLC [Member]
Sale Of Stock [Line Items]
Common stock, value of shares issuable								$ 6,600,000
Common stock, shares issued		932,237		932,237
Common stock , weighted average price per share		$ 4.93		$ 4.93
Proceeds from issuance of common stock, net				$ 4,500,000
Sales Agreement with MLV & Co. LLC [Member] | Subsequent event [Member]
Sale Of Stock [Line Items]
Common stock, value of shares issuable	$ 1,000,000
Common stock, shares issued	62,348
Common stock , weighted average price per share	$ 3.62
Proceeds from issuance of common stock, net	$ 219,000
Common stock, shares outstanding	4,000,000
Entity public float						$ 17,600,000
Common stock, closing price						$ 4.35
One third value of entity public float	$ 5,800,000