Convertible Senior Secured Notes (Details 2) (USD $)	12 Months Ended		0 Months Ended	1 Months Ended	12 Months Ended		0 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	May 03, 2013 Term loans under secured credit facility	May 31, 2013 Term loans under secured credit facility	Dec. 31, 2013 Term loans under secured credit facility	Dec. 31, 2011 Term loans under secured credit facility	Jan. 26, 2011 Initial term loan facility	Dec. 30, 2011 Additional term loan after amendment
Notes payable
Aggregate amount						$ 30,000,000
Drawdown under the secured credit facility		30,000,000					15,000,000	15,000,000
Repayment of debt			19,600,000	19,600,000
Loss on extinguishment of debt	$ 9,550,000				$ 1,200,000