Preferred Stock (Details)		1 Months Ended		12 Months Ended
	Aug. 15, 2011 right	Oct. 31, 2013 right	Mar. 31, 2012	Dec. 31, 2015 $ / shares shares
Shareholder Rights Plan
Number of rights for each outstanding share of common stock | right	1	20
Additional number of rights per common share | right	1
Number of rights deemed to be delivered for each share of common stock issued or transferred | right		20
Series A Junior Participating Cumulative Preferred Stock
Shareholder Rights Plan
Number of shares purchased on exercise of warrants				0.0001
Exercise price per share (in dollars per share) | $ / shares				$ 30.00
Preferred stock, shares authorized				45,000
Preferred stock, shares issued				0
Preferred stock, shares outstanding				0
Multiple of the value of common stock acquired (after conversion from preferred) to the exercise price of stock purchase right in the event of an acquiring person event				2
Multiple of the value of common stock acquired to the exercise price of stock purchase right in the event of a merger of the entity				2
Redemption price per right (in dollars per right) | $ / shares				$ 0.001
Series A Junior Participating Cumulative Preferred Stock | Minimum
Shareholder Rights Plan
Percentage of common stock to be acquired for rights to be exercisable by an individual or group				15.00%
Percentage of common stock to be owned for rights to be exercisable by an individual or group commencing a tender offer				15.00%
Eastern Capital Limited and its affiliates | Maximum
Shareholder Rights Plan
Percentage of common stock approved to be purchased			49.90%