Equity - Summary of Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Equity [Abstract]
Stock options, beginning balance | shares	4,012,096
Stock options, granted | shares	1,756,000
Stock options, exercised | shares	289,125
Stock options, canceled or expired | shares	12,500
Stock options, ending balance | shares	5,466,471
Stock options, exercisable, ending balance | shares	2,686,247
Weighted average exercise price, beginning balance	$ 2.04
Weighted average exercise price, granted	4.80
Weighted average exercise price, exercised	1.61
Weighted average exercise price, canceled or expired	3.19
Weighted average exercise price, ending balance	2.95
Weighted average exercise price, exercisable, ending balance	$ 1.52