Stockholder's Equity (Details Textual) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended						3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended						3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended							6 Months Ended	12 Months Ended		6 Months Ended
	Apr. 30, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Apr. 11, 2012	Apr. 10, 2012	Dec. 31, 2011	May 31, 2008	Jun. 30, 2012 Research and development [Member]	Jun. 30, 2012 Research and development [Member]	Jun. 30, 2012 General and administrative [Member]	Jun. 30, 2011 General and administrative [Member]	Jun. 30, 2012 General and administrative [Member]	Jun. 30, 2011 General and administrative [Member]	Jun. 30, 2012 Director [Member]	Jun. 30, 2012 Chief Executive Officer [Member]	Jun. 30, 2012 President and Chief Executive Officer and Employee [Member]	Jun. 30, 2012 Restricted Stock [Member]	Jun. 30, 2012 Restricted Stock [Member] Research and development [Member]	Jun. 30, 2012 Restricted Stock [Member] Research and development [Member]	Jun. 30, 2012 Restricted Stock [Member] General and administrative [Member]	Jun. 30, 2012 Restricted Stock [Member] General and administrative [Member]	Apr. 30, 2012 Restricted Stock Units [Member]	Jun. 30, 2012 Restricted Stock Units [Member]	Jun. 30, 2012 Restricted Stock Units [Member] Research and development [Member]	Jun. 30, 2012 Restricted Stock Units [Member] Research and development [Member]	Jun. 30, 2012 Restricted Stock Units [Member] General and administrative [Member]	Jun. 30, 2012 Restricted Stock Units [Member] General and administrative [Member]	Jun. 30, 2012 Restricted Stock Units [Member] Director [Member]	Apr. 10, 2012 Restricted Stock Units [Member] Director [Member]	Jun. 30, 2012 Restricted Stock Units [Member] Employee [Member]	Apr. 10, 2012 Restricted Stock Units [Member] Employee [Member]	Aug. 12, 2010 Maximum [Member]	Aug. 12, 2010 Minimum [Member]	Jun. 30, 2012 ESPP [Member]	Dec. 31, 2011 ESPP [Member]	Jun. 30, 2012 1994 Plan [Member]	Jun. 30, 2012 2004 Plan [Member]	Jun. 30, 2012 2010 Plan [Member]	Apr. 11, 2012 2010 Plan [Member]
Stockholder's Equity (Textual) [Abstract]
Issued warrants to purchase shares									390
Exercise price of Warrants granted		21,500		21,500
Term of common stock warrants				5 years
Outstanding warrants		$ 390		$ 390
Common stock are reserved for issuance upon exercise of the warrants		390		390
Common Stock authorized for issuance		12,008,000,000		12,008,000,000				6,008,000,000																														164	640	1,188,414
Options outstanding		592,230,573		592,230,573				894																														11	75	16
Stock option exercises				0
Shares remaining available for grants																																							537	1,188,398
Period of share-based payment awards																									36 months														10 years
Additional common shares authorized																																								47,805	676,640,705
Maximum percentage of the base salary of which an employee can purchase common stock																																				10.00%
Options exercisable have a weighted-average remaining contractual term				9 years 9 months 11 days
Common stock for options outstanding and exercisable intrinsic value		0		0				0
Common stock offered for purchase to employee							592,230,471
Options granted at exercise price							$ 0.06
Vesting period of two grants				3 years
Vesting period of the other grant				1 year
Percentage of grants vesting at one year anniversary of option award							25.00%
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
Increase in the shares of common stock authorized for issuance under the Employee Stock Purchase Plan																																		485	85
Restricted shares	2,987,850
Shares issued under the Employee Stock Purchase Plan		0		0
Purchase of common stock, shares		72		72
Common stock available for future issuance		413		413
Restricted shares vesting date		Jan. 19, 2013		Jan. 19, 2013
Shares issued under Employee Stock Purchase Plan																																				0	0
Shares of common stock issued and outstanding						10.00%
Unamortized share-based compensation expense		33,080,000		33,080,000												809,000		32,271,000
Unamortized share-based compensation expense																			128,000											342,000		1,000
Share-based compensation expense option issued																7 months	7 months	42 months							7 months
share-based compensation expense		$ 2,710,000	$ 63,000	$ 2,710,000	$ 131,000					$ 248,000	$ 248,000	$ 2,462,000	$ 63,000	$ 2,462,000	$ 131,000					$ 11,000	$ 10,691	$ 40,000	$ 40,259			$ 0	$ 0	$ 280,000	$ 279,744
Restricted stock units granted																															10,360,892		14,219
Contingent right to receive share of common stock																									1
Percentage of RSUs for employee vest																									25.00%
Restricted stock units weighted average grant date value																								$ 0.06