Changes in Number of Outstanding Shares of Common Stock (Detail)	9 Months Ended
	Sep. 30, 2015 shares
Stockholders Equity Note [Abstract]
Balance at beginning of the period	17,099,882
Common stock issued	11,304,673
Restricted common stock awards granted, net of forfeitures	240,990
Common stock options exercised, net of share repurchases	229,892
Common stock issued from Warrant exercises	26,027
Treasury shares acquired, net of reissuance	(9,698)
Balance at end of the period	28,891,766