Stockholders' Equity (Summary of Warrant Activity) (Detail) - Stock Purchase Warrants	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Warrant
Outstanding at December 31, 2014 | shares	133,591
Granted | shares	91,179
Forfeited | shares	(17,206)
Exercised | shares	(9,781)
Outstanding at December 31, 2015 | shares	197,783
Weighed Average Exercise Price
Outstanding at December 31, 2014 | $ / shares	$ 37.92
Granted | $ / shares	53.07
Forfeited | $ / shares	31.20
Exercised | $ / shares	30.62
Outstanding at December 31, 2015 | $ / shares	$ 45.85