Net Loss Per Share - Computation of Denominators Used in Net Loss Per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic:
Weighted average common shares outstanding	25,545,164	22,713,040	23,737,443	20,351,005
Diluted:
Weighted average common shares outstanding - Basic	25,545,164	22,713,040	23,737,443	20,351,005
Common stock options	0	0	0	0
Common stock warrants	0	0	0	0
Convertible preferred stock	0	0	0	0
Denominator for diluted net loss per share	25,545,164	22,713,040	23,737,443	20,351,005