Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accounting Policies [Abstract]
Percentage of inventory reserve		100.00%
Preferred stock converted into common stock	1,826,380	3,718,804	1,826,380
Outstanding stock options and warrants	2,434,936	7,353,848	2,434,936
Dilutive securities not included in calculation of loss per common share		0	0
Impairment expense related to investment	$ 700,000	$ 300,000	$ 700,000