Stockholders' Equity - Series B Convertible Preferred Stock - Additional Information (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Aug. 25, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Preferred stock, par value	$ 0.001		$ 0.001
Convertible preferred stock, dividend percentage	8.00%
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, par value		$ 0.001
Convertible preferred stock, dividend percentage	8.00%