Stockholders' Equity (Details Textual) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended				3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended					3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended									9 Months Ended	12 Months Ended		9 Months Ended
	Apr. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Apr. 11, 2012	Apr. 10, 2012	May 31, 2008	Sep. 30, 2012 Research and development [Member]	Sep. 30, 2012 Research and development [Member]	Sep. 30, 2012 General and administrative [Member]	Sep. 30, 2011 General and administrative [Member]	Sep. 30, 2012 General and administrative [Member]	Sep. 30, 2011 General and administrative [Member]	Sep. 30, 2012 Director [Member]	Sep. 30, 2012 President and Chief Executive Officer and Employee [Member]	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2012 Restricted Stock [Member] Research and development [Member]	Sep. 30, 2012 Restricted Stock [Member] Research and development [Member]	Sep. 30, 2012 Restricted Stock [Member] General and administrative [Member]	Sep. 30, 2012 Restricted Stock [Member] General and administrative [Member]	Aug. 31, 2012 Restricted Stock Units [Member]	Apr. 30, 2012 Restricted Stock Units [Member]	Sep. 30, 2012 Restricted Stock Units [Member]	Aug. 20, 2012 Restricted Stock Units [Member]	Sep. 30, 2012 Restricted Stock Units [Member] Research and development [Member]	Sep. 30, 2012 Restricted Stock Units [Member] Research and development [Member]	Sep. 30, 2012 Restricted Stock Units [Member] General and administrative [Member]	Sep. 30, 2012 Restricted Stock Units [Member] General and administrative [Member]	Sep. 30, 2012 Restricted Stock Units [Member] Director [Member]	Apr. 10, 2012 Restricted Stock Units [Member] Director [Member]	Sep. 30, 2012 Restricted Stock Units [Member] Employee [Member]	Apr. 10, 2012 Restricted Stock Units [Member] Employee [Member]	Sep. 30, 2012 Restricted Stock Units [Member] Consultant [Member]	Aug. 17, 2012 Restricted Stock Units [Member] Consultant [Member]	Aug. 12, 2010 Maximum [Member]	Aug. 12, 2010 Minimum [Member]	Sep. 30, 2012 ESPP [Member]	Dec. 31, 2011 ESPP [Member]	Sep. 30, 2012 1994 Plan [Member]	Sep. 30, 2012 2004 Plan [Member]	Oct. 01, 2012 2010 Plan [Member]	Sep. 30, 2012 2010 Plan [Member]	Apr. 11, 2012 2010 Plan [Member]
Stockholders' Equity (Textual) [Abstract]
Common Stock authorized for issuance		12,008,000,000		12,008,000,000		6,008,000,000																																			164	640		1,188,414
Options outstanding		592,230,570		592,230,570		894																																			8	75		16
Shares remaining available for grants																																									0	537		1,236,202
Period of share-based payment awards																									36 months																	10 years
Additional common shares authorized																																											120,520	47,804	676,640,705
Maximum percentage of the base salary of which an employee can purchase common stock																																							10.00%
Common stock are reserved for issuance upon exercise of the warrants		390		390																																					593,467,889	593,467,889		593,467,889
Unamortized share-based compensation expense																		$ 70,000													$ 184,000		$ 702
Share-based compensation expense option issued																4 months	40 months								4 months
Increase in the shares of common stock authorized for issuance under the Employee Stock Purchase Plan																																					485	85
Share-based compensation expense		2,962,000	63,000	5,672,000	194,000					279,000	526,000	2,683,000	63,000	5,146,000	194,000				12,000	23,000	46,000	86,000					55	151	159,000	439,000
Restricted stock units granted																																10,360,892		14,219		2,700,000
Contingent right to receive share of common stock																									1
Percentage of RSUs for employee vest																									25.00%	45.50%
Restricted stock units weighted average grant date value																							$ 0.069	$ 0.06
Shares issued under Employee Stock Purchase Plan																																							0	0
Shares of common stock issued and outstanding							10.00%
Unamortized share-based compensation expense		30,428,000		30,428,000												444,000	29,984,000																		81,000
Stockholders' Equity (Additional Textual) [Abstract]
Issued warrants to purchase shares									390
Exercise price of Warrants granted		2,150		2,150
Term of common stock warrants				5 years
Outstanding warrants		390		390
Common stock offered for purchase to employee								592,230,471
Options granted at exercise price								$ 0.06
Percentage of grants vesting at one year anniversary of option award								25.00%
Options exercisable have a weighted-average remaining contractual term				9 years 6 months 11 days
Common stock for options outstanding and exercisable intrinsic value		0		0		0
Percentage of common stock market value used for purchase price of Employee Stock Purchase Plan		85.00%		85.00%
Maximum offer period for share purchase				24 months
Shares issued under the Employee Stock Purchase Plan		0		0		0
Purchase of common stock, shares		72		72
Common stock available for future issuance		413		413
Restricted shares	2,987,850
Vesting period of two grants				3 years
Vesting period of the other grant				1 year
Stock option exercises						$ 0
Restricted shares vesting date		Jan. 19, 2013		Jan. 19, 2013