Equity - Additional Information (Detail)		12 Months Ended
	Jan. 04, 2018	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 $ / shares shares
Stockholders Equity [Line Items]
Common stock, shares authorized		120,000,000	120,000,000
Common stock, par value | $ / shares		$ 0.01	$ 0.01
Preferred stock, shares authorized		5,000,000	5,000,000
Preferred stock, par value | $ / shares		$ 0.001	$ 0.001
Common stock voting rights description		One vote per share
Common stock, shares outstanding		6,805,686	6,746,579
Preferred stock issued		0	0
Preferred stock outstanding		0	0
Subsequent Events [Member]
Stockholders Equity [Line Items]
Reverse stock split, conversion ratio	0.25