Shareholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended		12 Months Ended
	Mar. 31, 2013	Sep. 30, 2011	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2012	Nov. 30, 2010	Mar. 31, 2002
Class of Stock [Line Items]
Preferred stock, authorized (in shares)			1,000,000	1,000,000
Preferred stock, par value (in dollars per share)			$ 0.01	$ 0.01
Dividends declared, share, preferred stock purchase right for outstanding common stock								1
Exercise Price			$ 0.01
Minimum ownership percentage for change			5.00%
Period for ownership change			3 years
Right plan expiration date	Jul. 03, 2013	Mar. 12, 2012
Right plan extended expiration date	Jul. 03, 2016	Jul. 03, 2013
Share based compensation expense, shares			42,203	13,106	23,562
Proceeds from exercise of warrants			$ 0	$ 0
Warrants outstanding			0	0
Conversion Threshold, 15% [Member]
Class of Stock [Line Items]
Preferred stock, conversion trigger, percentage ownership change								15.00%
Conversion Threshold, Greater than 15% and Less than 50% [Member]
Class of Stock [Line Items]
Preferred stock, conversion trigger, percentage ownership change								50.00%
Conversion Threshold, Revised, 4.99% [Member]
Class of Stock [Line Items]
Preferred stock, conversion trigger, percentage ownership change							4.99%
Series B Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, shares issued upon conversion			2.5
Preferred stock, shares outstanding (in shares)			130	130
Preferred stock, liquidation preference per share			$ 100
Votes per share			1
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock redemption price per share			1,000
Preferred stock convertible to common stock, conversion price per share			$ 28.00
Average percentage of closing price			100.00%
Consecutive trading days required for conversion			3 years
Stock issued during period, shares, conversion of convertible securities						50
Dividend payable, preferred stock			5.00%
Preferred stock, redemption amount						$ 50,000
Preferred stock, shares outstanding (in shares)			550	550		550
Series C Preferred Stock [Member] | Maximum [Member]
Class of Stock [Line Items]
Stock issued during period, shares, conversion of convertible securities			294,045
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, conversion amount, per one thousandth of a share								$ 30