Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended		12 Months Ended
	Jul. 09, 2012	Jan. 06, 2010	Dec. 31, 2012	Jan. 02, 2012
Rights offering and private placement of common stock
Par value of common stock issued (in dollars per share)			$ 0.01	$ 0.01
Net proceeds from the rights offering and private placement of common stock	$ 12.6	$ 4.9
Minimum percentage of stock ownership required to effect ownership change		5.00%	5.00%
Minimum percentage points by which aggregate stock ownership of holders of at least 5% of stock must increase to effect ownership change		50.00%	50.00%
Period over which aggregate stock ownership of holders of at least 5% of stock must increase to effect ownership change		3 years	3 years
Rights offering
Rights offering and private placement of common stock
Number of shares of common stock issued	19,661,844	10,000,000
Par value of common stock issued (in dollars per share)	$ 0.01	$ 0.01
Subscription price (in dollars per share)	$ 0.65	$ 0.50
Private placement
Rights offering and private placement of common stock
Number of shares of common stock issued	2,534,323	451,677
Par value of common stock issued (in dollars per share)	$ 0.01	$ 0.01
Subscription price (in dollars per share)	$ 0.65	$ 0.50