Earnings Per Share - Additional Information (Detail) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014
Earnings Per Share Disclosure [Line Items]
Options outstanding	3,220,000				3,130,000
Options Granted, exercise price	$ 1.11
Stock Option
Earnings Per Share Disclosure [Line Items]
Options Granted	90,000	90,000
Options Granted, exercise price	$ 1.11	$ 1.18
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	Feb. 25, 2025	Jul. 16, 2023
Stock Options1
Earnings Per Share Disclosure [Line Items]
Options Granted			1,300,000	120,000
Options Granted, exercise price			$ 1.22	$ 2.27
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date			Jan. 09, 2022	Oct. 31, 2021
Stock Options 2
Earnings Per Share Disclosure [Line Items]
Options Granted			120,000	1,500,000
Options Granted, exercise price			$ 1.49	$ 2.59
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date			Apr. 01, 2022	Oct. 31, 2021
Warrant
Earnings Per Share Disclosure [Line Items]
Warrants issued	294,000
Warrant 1
Earnings Per Share Disclosure [Line Items]
Warrants issued				150,000
Warrants issued, exercise price				$ 3.25
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date				Jan. 13, 2016
Warrant 2
Earnings Per Share Disclosure [Line Items]
Warrants issued				144,000
Warrants issued, exercise price				$ 3.99