Stockholders' Equity - Additional Information (Detail)		1 Months Ended		12 Months Ended
	Dec. 23, 2015 USD ($)	Jun. 30, 2016 USD ($) shares	Sep. 30, 2003 USD ($) shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares	Jun. 13, 2011 shares	Dec. 13, 2010 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized (shares)				5,000,000	5,000,000
Number of common shares authorized				175,000,000	175,000,000
Threshold to exercise rights after designated events				10 days
Percentage of outstanding shares acquired to exercise preferred share rights				15.00%
Waiting period after rights activated				5 days
Right to purchase shares				2
Transfer of assets or earnings power				50.00%
Shares of common stock issuable upon conversion or exercise of rights granted (shares)				25,200,000
Maximum proceeds to be raised | $	$ 100,000,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares authorized						100,000,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares authorized						175,000,000
Series B Junior Participating Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized (shares)				1,500,000	1,500,000		1,500,000.0
Preferred stock issued (shares)				0	0
Convertible preferred stock outstanding (shares)				0	0
Series E Convertible Voting Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized (shares)				2,000	2,000
Cash proceeds from exchange of preferred stock | $			$ 20,000,000
Preferred stock issued (shares)			2,000	0	20
Preferred stock converted into common stock (shares)		40,000	4,000,000	40,000	40,000
Convertible preferred stock outstanding (shares)				0	20
Converted (shares)		20
Dividends in arrears | $		$ 6,000