Fair Value of Financial Instruments (Details 2) (USD $)		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Common stock warrant	Dec. 31, 2013 Common stock warrant Minimum	Dec. 31, 2013 Common stock warrant Maximum	Dec. 31, 2013 Interest make-whole liability	Dec. 31, 2013 7.50% Convertible Senior Secured Notes due 2019	May 03, 2013 7.50% Convertible Senior Secured Notes due 2019
Assumptions used to calculate fair value of common stock warrant liability using Monte-Carlo simulation on a Black-Scholes lattice model
Interest rate (as a percent)	7.50%					7.50%	7.50%
Exercise Price (in dollars per share)			$ 4.00	$ 5.00
Volatility (as a percent)		70.00%			45.00%
Stock Price (in dollars per share)		$ 7.54			$ 7.54
Credit Spread (as a percent)					12.00%
Term			7 years 1 month 6 days	8 years	3 years 3 months 18 days
Dividend Yield (as a percent)		0.00%			0.00%
Risk-Free Rate (as a percent)			2.55%	2.75%