Derivative Financial Instruments - Warrants (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended	170 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013
Changes in the Company's derivative financial instruments liability balance
Balance of warrants outstanding at the beginning of the period (in shares)			6,985,070
Balance of warrants outstanding at the end of the period (in shares)	6,306,582		6,306,582		6,985,070	6,306,582
Balance of derivative financial instruments liability at the beginning of the period			$ 8,765,628
Reclassification of derivative liability to equity			(5,417,871)	(3,317,463)	(3,317,463)	(8,735,334)
Change in fair value of warrants recognized as a loss in the statement of operations	1,317,360	(388,750)	2,933,527	1,824,565		8,428,326
Balance of derivative financial instruments liability at the end of the period	6,281,284		6,281,284		8,765,628	6,281,284
Binomial option pricing method | Change in Fair value of Derivative Liability For Previously Outstanding Price Protected Units
Changes in the Company's derivative financial instruments liability balance
Balance of derivative financial instruments liability at the beginning of the period			1,341,405
Reclassification of derivative liability to equity			(5,417,871)
Change in fair value of warrants recognized as a loss in the statement of operations			2,905,003
Balance of derivative financial instruments liability at the end of the period	(1,171,463)		(1,171,463)			(1,171,463)
Binomial option pricing method | Derivative Liability For Issued Units
Changes in the Company's derivative financial instruments liability balance
Balance of derivative financial instruments liability at the end of the period	1,171,463		1,171,463		1,171,463	1,171,463
Warrants | Black-Scholes option pricing method
Range of assumptions used to determine the fair value of warrants
Expected volatility (as a percent)				90.00%
Dividend yield (as a percent)			0.00%	0.00%
Changes in the Company's derivative financial instruments liability balance
Balance of warrants outstanding at the beginning of the period (in shares)			1,087,060
Balance of warrants outstanding at the end of the period (in shares)	1,087,060		1,087,060			1,087,060
Balance of derivative financial instruments liability at the beginning of the period			6,252,760
Change in fair value of warrants recognized as a loss in the statement of operations			28,524
Balance of derivative financial instruments liability at the end of the period	6,281,284		6,281,284			6,281,284
Warrants | Black-Scholes option pricing method | Minimum
Range of assumptions used to determine the fair value of warrants
Estimated fair value of the entity's common stock (in dollars per share)			$ 6.26	$ 1.20
Expected warrant term			1 month	1 month
Risk-free interest rate (as a percent)			0.03%	0.09%
Expected volatility (as a percent)			95.00%
Warrants | Black-Scholes option pricing method | Maximum
Range of assumptions used to determine the fair value of warrants
Estimated fair value of the entity's common stock (in dollars per share)			$ 7.18	$ 3.07
Expected warrant term			5 years 9 months 18 days	6 years
Risk-free interest rate (as a percent)			1.41%	0.92%
Expected volatility (as a percent)			100.00%
Warrants | Binomial option pricing method
Changes in the Company's derivative financial instruments liability balance
Balance of derivative financial instruments liability at the beginning of the period			2,512,868
Reclassification of derivative liability to equity			(5,417,871)
Change in fair value of warrants recognized as a loss in the statement of operations			$ 2,905,003
Number of Price Protected Units at the beginning of the period (in shares)			1,288,650
Reclassification of derivative liability to equity			(1,288,650)