Share-Based Payments - Activity of Non-Vested Stock Options (Detail) - Common Stock Options	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Number of shares
Nonvested common stock options, beginning balance | shares	81,400
Common stock options vested | shares	(31,400)
Common stock options forfeited | shares	(50,000)
Weighted Average Exercise Price Per Share
Nonvested common stock options, beginning balance | $ / shares	$ 7.62
Common stock options vested | $ / shares	3.84
Common stock options forfeited | $ / shares	$ 10.00