Terrapin Opportunity, L.P. Common Stock Purchase Agreement (Details) (USD $)	0 Months Ended			1 Months Ended	6 Months Ended	12 Months Ended	13 Months Ended		6 Months Ended
	May 20, 2013	May 21, 2013	Dec. 28, 2012	Jun. 30, 2013	Jun. 30, 2014 draw_down_notice	Dec. 31, 2013	Jun. 30, 2014	Dec. 28, 2012	Jun. 30, 2014 Terrapin [Member]
Debt Instrument [Line Items]
Maximum value of shares required to be purchased per terms of stock purchase agreement					$ 24,000,000.0		$ 24,000,000.0	$ 30,000,000.0
Stock Purchase Agreement Term			24 months
Number of draw down notices (in notices)					36
Draw down period					10 days
Minimum discount percentage per each share sold under the stock sold agreement								3.50%
Maximum discount percentage per each share sold under the stock purchase agreement								8.00%
Maximum beneficial ownership percentage allowed per terms of stock purchase agreement								9.90%
Number of shares issued (in shares)	78,125,000	15,625,000		28,125,000		121,900,000			6,100,000.0
Proceeds from common stock	$ 25,000,000	$ 5,000,000		$ 9,000,000		$ 39,000,000	$ 65,000,000		$ 6,000,000.0