Changes in the Shares of Common Stock Outstanding (Detail) - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Stockholders Equity Note [Abstract]
Beginning balance	28,891,766	17,099,882
Common stock issued		11,304,673
Common stock acquired		(9,698)
Restricted common stock awards granted, net of forfeitures	434,494	240,990
Common stock options exercised, net of treasury shares reissued	27,500	229,892
Warrants exercised, net of repurchases	7,552	26,027
Ending balance	29,361,312	28,891,766