Warrants Outstanding (Details)	0 Months Ended		1 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended									3 Months Ended					3 Months Ended
	May 20, 2013	May 21, 2013	Jun. 30, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Thermo	Sep. 30, 2014 Contingent Equity Agreement		Dec. 31, 2013 Contingent Equity Agreement		Sep. 30, 2014 Thermo Loan Agreement		Dec. 31, 2013 Thermo Loan Agreement		Sep. 30, 2014 Thermo Loan Agreement Thermo	Sep. 30, 2014 5.00% Convertible Senior Unsecured Notes		Dec. 31, 2013 5.00% Convertible Senior Unsecured Notes		Sep. 30, 2014 8.00% Convertible Senior Unsecured Notes Issued in 2009		Apr. 15, 2014 8.00% Convertible Senior Unsecured Notes Issued in 2009	Dec. 31, 2013 8.00% Convertible Senior Unsecured Notes Issued in 2009		May 20, 2013 8.00% Convertible Senior Unsecured Notes Issued in 2009	Jun. 30, 2009 8.00% Convertible Senior Unsecured Notes Issued in 2009
Class of Warrant or Right [Line Items]
Warrants outstanding (warrants)				45,088,418	93,516,401		37,088,418	[1]	41,467,980	[1]	0	[2]	4,205,608	[2]		8,000,000	[3]	8,000,000	[3]	0	[4]		39,842,813	[4]		15,300,000
Exercise price of warrants (USD per warrant)							0.01	[1]	0.01	[1]	0	[2]	0.01	[2]		0.32	[3]	0.32	[3]	0	[4]	0.32	0.32	[4]
Expiration period				5 years
Number of warrants exercised (in warrants)	78,125,000	15,625,000	28,125,000		121,900,000	4,400,000									4,200,000					14,700,000
Loan interest rate															12.00%	5.00%				8.00%					8.00%	8.00%

[1] Pursuant to the terms of the Contingent Equity Agreement, the Company has issued to Thermo warrants to purchase shares of common stock pursuant to the annual availability fee and subsequent reset provisions in the Contingent Equity Agreement. These warrants have a five-year exercise period from issuance. These warrants were issued between June 2009 and June 2012, and the exercise periods expire between June 2014 and June 2017. As of September 30, 2014, Thermo had exercised warrants to purchase approximately 4.4 million of these shares prior to the expiration of the associated warrants.

[2] As consideration for the Loan Agreement with Thermo, the Company issued Thermo warrants to purchase shares of common stock. The exercise period of the warrants issued in connection with the Thermo Loan Agreement was five years from issuance, which expired in June 2014. Thermo exercised all of these warrants in the second quarter of 2014.

[3] The 5.0% Warrants are exercisable until June 2016, which is five years after their issuance.

[4] The exercise period for the 8.00% Warrants began on December 19, 2009 and ended on June 14, 2014. All 8.00% Warrants were exercised in the second quarter of 2014.