Stockholders' Equity (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			1 Months Ended	9 Months Ended								0 Months Ended	1 Months Ended	9 Months Ended		9 Months Ended	0 Months Ended	1 Months Ended			9 Months Ended		9 Months Ended					9 Months Ended		0 Months Ended
	Sep. 24, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	May 12, 2013	Sep. 30, 2013 Restricted Stock Research and development	Sep. 30, 2012 Restricted Stock Research and development	Sep. 30, 2013 Restricted Stock Research and development	Sep. 30, 2012 Restricted Stock Research and development	Sep. 30, 2013 Restricted Stock General and administrative	Sep. 30, 2012 Restricted Stock General and administrative	Sep. 30, 2013 Restricted Stock General and administrative	Sep. 30, 2012 Restricted Stock General and administrative	Sep. 24, 2013 Restricted Stock Units (RSUs)	Sep. 30, 2013 Restricted Stock Units (RSUs) Research and development	Sep. 30, 2012 Restricted Stock Units (RSUs) Research and development	Sep. 30, 2013 Restricted Stock Units (RSUs) Research and development	Sep. 30, 2012 Restricted Stock Units (RSUs) Research and development	Sep. 30, 2013 Restricted Stock Units (RSUs) General and administrative	Sep. 30, 2012 Restricted Stock Units (RSUs) General and administrative	Sep. 30, 2013 Restricted Stock Units (RSUs) General and administrative	Sep. 30, 2012 Restricted Stock Units (RSUs) General and administrative	Sep. 30, 2013 Common Stock	Apr. 30, 2013 Common Stock Restricted Stock	Sep. 30, 2013 Common Stock Restricted Stock	Sep. 30, 2013 Common Stock Restricted Stock Units (RSUs)	Sep. 30, 2013 Common Stock President And Chief Executive Officer	Sep. 30, 2013 Common Stock Director	Sep. 30, 2013 Common Stock Director Restricted Stock	Sep. 30, 2013 Common Stock Employees	Sep. 30, 2013 Common Stock Employees Restricted Stock	Sep. 30, 2013 Common Stock Officer Restricted Stock	Sep. 24, 2013 Series C-1 Preferred Stock	May 25, 2013 Series C-1 Preferred Stock	Sep. 30, 2013 Series C-1 Preferred Stock	Dec. 31, 2012 Series C-1 Preferred Stock	Sep. 30, 2013 Series C-1 Preferred Stock Common Stock	Sep. 24, 2013 Series C-2 Preferred Stock	May 25, 2013 Series C-2 Preferred Stock	Sep. 30, 2013 Series C-2 Preferred Stock	Dec. 31, 2012 Series C-2 Preferred Stock	Sep. 30, 2013 Series D-1 Preferred Stock	Dec. 31, 2012 Series D-1 Preferred Stock	Sep. 30, 2013 Series D-1 Preferred Stock Common Stock	Sep. 30, 2013 Series D-2 Preferred Stock	Sep. 30, 2013 Series F Preferred Stock	Sep. 24, 2013 Series F Preferred Stock	Dec. 31, 2012 Series F Preferred Stock	Sep. 30, 2013 Private Placement Common Stock Restricted Stock	Sep. 30, 2013 Private Placement Common Stock Management Restricted Stock	Sep. 24, 2013 Private Placement Series F Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock issued																								200,333,477	200,000	200,000	2,000,000	800,000	300,000	3,981,146	700,000	16,809,282	66,352,429					2,663,114							10,095,731					96,431,775	87,142,857
Preferred stock, shares authorized		8,000,000		8,000,000																																11,000	11,000				22,000	22,000	5,134	5,134		10,868	10,000		10,000
Preferred stock, par value		$ 0.0001		$ 0.0001																																$ 0.0001	$ 0.0001				$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001			$ 0.0001		$ 0.0001
Preferred stock, shares issued																																				7,081	5,792				0	500	0	4,615			3,250		0
Securities Purchase Agreement, number of shares issued in transaction																																																				3,250
Convertible preferred stock, conversion to common stock ratio		0.00007
Convertible preferred stock, conversion right cap, percent of common stock ownership																																																9.999%
Securities Purchase Agreement, price per share																																																				$ 1,000
Preferred stock dividends, shares																																		311	433				27	30
Preferred stock converted into common stock																																				11			557				47
Issued warrants to purchase shares		390		390
Exercise price of Warrants granted		$ 21,500		$ 21,500
Term of common stock warrants				5 years
Warrants Expired						390
Outstanding warrants		0		0
Equity plan, term	10 years
Unamortized share-based compensation expense		$ 0		$ 0
Stock options canceled	592,230,471			592,230,471
Unrecognized share-based compensation expense at the time of modification	17,000,000
Restricted stock, award vesting rights																									The shares were issued under the 2010 Plan and vest quarterly beginning on January 14, 2013. These shares are subject to a reacquisition right if the services of the holder are terminated during the vesting period.
Share-based compensation expense		2,742,000	2,962,000	8,568,000	5,672,000		7,000	12,000	51,000	23,000	593,000	46,000	714,000	86,000		47	0	157	0	0	253,000	52,000	533,000
Recognized weighted average period									20 months				38 months
Unamortized share-based compensation expense							$ 1,900,000		$ 1,900,000		$ 17,000,000		$ 17,000,000
RSUs canceled															10,375,111