Stock Purchase Warrants - Additional Information (Detail) - USD ($)		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Warrant or Right [Line Items]
Warrants to Purchase shares of Common Stock		1,384,608
Weighted Average Exercise Price, per share		$ 9.52
Weighted Average Remaining Life		1 month 6 days
Class of warrants excercised		$ 0	$ 0
Class of warrants issued and expired		0	0
Subsequent Event [Member]
Class of Warrant or Right [Line Items]
Class of warrants issued and expired unexercised	1,324,608