Net Loss Per Share - Computation of Denominators Used in Net Loss per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Basic:
Weighted average common shares outstanding	27,282,863	25,545,164	27,275,133	23,737,443
Diluted:
Weighted average common shares outstanding - Basic	27,282,863	25,545,164	27,275,133	23,737,443
Common stock options	0	0	0	0
Denominator for diluted net loss per share	27,282,863	25,545,164	27,275,133	23,737,443