Preferred Stock, Common Stock and Stockholders' Equity - Summary of Nonvested Options Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Shares Nonvested , Outstanding beginning balance	424,419
Shares, Granted	354,000
Shares Vested	(270,998)
Shares Nonvested , Outstanding ending balance	507,421	424,419
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value Per Share, Nonvested beginning balance	$ 9.02
Weighted Average Grant Date Fair Value Per Share, Granted	4.03	$ 4.76
Weighted Average Grant Date Fair Value Per Share, Vested	8.07
Weighted Average Grant Date Fair Value Per Share, Nonvested ending balance	$ 7.60	$ 9.02