Stockholders' Equity (Summary of Warrant Activity) (Detail) - Stock Purchase Warrants	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Warrant
Outstanding beginning balance | shares	197,783
Granted | shares	10,444
Forfeited | shares	(55,474)
Exercised | shares	(34,824)
Outstanding at December 31, 2016 | shares	117,929
Weighed Average Exercise Price
Outstanding at December 31, 2015 | $ / shares	$ 45.85
Granted | $ / shares	67.00
Forfeited | $ / shares	39.91
Exercised | $ / shares	38.05
Outstanding at December 31, 2016 | $ / shares	$ 52.82