Convertible Notes, Long-Term Debt and Credit Facility (Additional Disclosures) (Details) (USD $)	0 Months Ended	1 Months Ended		12 Months Ended			0 Months Ended	1 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Jan. 22, 2013	Jun. 30, 2012	Nov. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Feb. 11, 2008	Mar. 31, 2010 Term loan [Member]	Jun. 30, 2011 Term loan [Member]	Dec. 31, 2013 Term loan [Member]	Mar. 31, 2010 Senior credit facility [Member]	Dec. 31, 2013 Exchange Agreement [Member]
Line of Credit Facility [Line Items]
Commitment Fee Percentage									50.00%		50.00%
Share lending agreement, number of common stock shares loaned				3,800,000		3,800,000
Own share lending arrangement nominal loan fee per share						$ 0.0001
Share lending agreement, fair value						$ 500,000
Return of borrowed shares under share-based, shares	2,439,558	659,340	701,102	2,439,558	659,340
Face amount							40,000,000.0
Maturity date							Nov. 01, 2012
Periodic prinicpal payments							1,000,000
Term loan, annual interest rate							12.50%
Senior note commitment fee										7,300,000
Loss on the extinguishment of debt								$ 2,100,000