Equity-Based Compensation (Details)	1 Months Ended		6 Months Ended
	May 31, 2012 Stock options William Heiden	May 31, 2012 Restricted stock units William Heiden	Jun. 30, 2012 2007 Equity Incentive Plan	Jun. 30, 2012 2007 Equity Incentive Plan Minimum	Jun. 30, 2012 2007 Equity Incentive Plan Maximum	Jun. 30, 2012 2000 Stock Plan
Equity compensation plans
Number of options and restricted stock units granted (in shares)			5,161,025
Number of stock options expired or terminated (in shares)			1,723,324
Number of restricted stock units expired or terminated (in shares)			584,880
Stock options exercised (in shares)			35,338
Shares of common stock issued pursuant to vested restricted stock units			247,725
Number of stock options outstanding (in shares)			2,186,032			390,742
Number of restricted stock units outstanding (in shares)			383,726
Remaining number of shares available for future grants			847,505
Period from date of grant within which awards expire				7 years	10 years
Number of options granted (in shares)	300,000
Number of restricted stock units granted (in shares)		100,000
Award vesting period (in years)	4 years	4 years