Stock Compensation Plans and Stock Based Compensation (Details 13) In Thousands, unless otherwise specified	Dec. 31, 2011
Common stock reserved for future issuance
Common stock reserved for future issuance	114,697
Employee equity incentive plans [Member]
Common stock reserved for future issuance
Common stock reserved for future issuance	46,776
2015 Warrants (Note 3 ) [Member]
Common stock reserved for future issuance
Common stock reserved for future issuance	46,382
2011 and 2013 Notes Warrants (Note 3) [Member]
Common stock reserved for future issuance
Common stock reserved for future issuance	13,922
Employee stock purchase plans [Member]
Common stock reserved for future issuance
Common stock reserved for future issuance	5,299
Directors stock option plans [Member]
Common stock reserved for future issuance
Common stock reserved for future issuance	2,307
2023 Notes conversion [Member]
Common stock reserved for future issuance
Common stock reserved for future issuance	11