Stockholders' Equity (Details) (USD $)	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended					12 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2006	Dec. 31, 2005	Dec. 31, 2009 Affiliated Entity	Jun. 18, 2010 Affiliated Entity	Jun. 19, 2008 Affiliated Entity	Jun. 19, 2008 Extended Expiration Period [Member] Affiliated Entity	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]
Equity [Abstract]
Capital units, authorized											110,000,000
Common stock, shares authorized											100,000,000	100,000,000
Preferred stock, shares authorized											10,000,000
Class of Warrant or Right [Line Items]
Commitment to Invest																		$ 8,000,000
Warrants to purchase percentage of acquired shares																		40.00%
Warrants to purchase common stock														1,000,000	1,000,000	326,797	718,954		238,000
Exercise price of warrants to purchase common stock											2.92			4.99	1.18	3.519	3.519		3.06
Proceeds from issuance of warrants and options																2,500,000	5,500,000
Warrants contractual term (in years)																4 years
Warrants, outstanding											815,568
Number of warrants, adjustment											337,594
Common stock, shares issued											51,642,520	51,637,352				816,993	1,797,386
Common stock warrants, current and noncurrent																				991,039	1,538,145
Change In fair value of common stock warrants	$ 999,529	$ 133,375	$ (904,731)	$ (12,841,849)	$ (5,543,721)	$ (4,952,670)	$ 94,798	$ (10,496,391)	$ 228,173	$ (23,338,240)	$ (804,516)	$ (24,436,309)	$ 38,110,030