Equity-Based Compensation (Details) (USD $)	1 Months Ended		3 Months Ended					1 Months Ended
	Feb. 28, 2013 Restricted stock units Senior management	Feb. 28, 2013 Restricted stock units Senior management Maximum	Mar. 31, 2013 2007 Equity Incentive Plan	Mar. 31, 2013 2007 Equity Incentive Plan Stock options Minimum	Mar. 31, 2013 2007 Equity Incentive Plan Stock options Maximum	Mar. 31, 2013 2000 Stock Plan	Mar. 31, 2013 2000 Stock Plan Restricted stock units	Jan. 31, 2013 Other Equity Compensation Grants Stock options Chief Commercial Officer	Jan. 31, 2013 Other Equity Compensation Grants Restricted stock units Chief Commercial Officer
Equity compensation plans
Number of options and restricted stock units granted (in shares)			6,085,975
Number of stock options expired or terminated (in shares)			2,409,472
Number of restricted stock units expired or terminated (in shares)			619,537
Stock options exercised (in shares)			38,900
Shares of common stock issued pursuant to vested restricted stock units			383,200
Number of stock options outstanding (in shares)			2,259,972			114,641
Number of restricted stock units outstanding (in shares)			374,894				0
Remaining number of shares available for future grants			954,851
Expiration term				7 years	10 years
Number of options granted (in shares)								75,000
Number of restricted stock units granted (in shares)	82,500								35,000
Award vesting period	3 years							4 years	4 years
Fair value of awards issued		$ 700,000
Expense recognition period	3 years