Share-Based Compensation Plans - Summary of Option Activity under Company's Share-Based Compensation Plans (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at January 1, 2016, Number of Shares	2,326,401
Options granted, Number of Shares	27,500
Options exercised, Number of Shares	0	0
Options forfeited, Number of Shares	0
Options canceled, Number of Shares	(214,482)
Outstanding at March 31, 2016, Number of Shares	2,139,419
Outstanding at January 1, 2016, Weighted Average Exercise Price	$ 4.23
Options granted, Weighted Average Exercise Price	0.69
Options exercised, Weighted Average Exercise Price	0
Options forfeited, Weighted Average Exercise Price	0
Options canceled, Weighted Average Exercise Price	(9.73)
Outstanding at March 31, 2016, Weighted Average Exercise Price	$ 3.64