Equity-Based Compensation (Details)	6 Months Ended	1 Months Ended			6 Months Ended					30 Months Ended	6 Months Ended	30 Months Ended	6 Months Ended	30 Months Ended
	Jun. 30, 2014 plan	May 31, 2013 Equity Incentive Plan2007 [Member]	May 31, 2010 Equity Incentive Plan2007 [Member]	May 31, 2009 Equity Incentive Plan2007 [Member]	Jun. 30, 2014 Equity Incentive Plan2007 [Member]	Jun. 30, 2014 Equity Incentive Plan2007 [Member] Employee And Non Employee Stock Option [Member] Minimum [Member]	Jun. 30, 2014 Equity Incentive Plan2007 [Member] Employee And Non Employee Stock Option [Member] Maximum [Member]	Jun. 30, 2014 Stock Plan2000 [Member]	Jun. 30, 2014 Stock Plan2000 [Member] Employee And Non Employee Stock Option [Member]	Jun. 30, 2014 Other Equity Compensation Grants [Member] Senior Management [Member]	Jun. 30, 2014 Other Equity Compensation Grants [Member] Employee And Non Employee Stock Option [Member] Senior Management [Member]	Jun. 30, 2014 Other Equity Compensation Grants [Member] Employee And Non Employee Stock Option [Member] Senior Management [Member]	Jun. 30, 2014 Other Equity Compensation Grants [Member] Restricted Stock Units R S U [Member] Senior Management [Member]	Jun. 30, 2014 Other Equity Compensation Grants [Member] Restricted Stock Units R S U [Member] Senior Management [Member]
Equity-Based Compensation
Number of equity compensation plans	2
Equity and other compensation plans
Shares authorized for issuance		1,100,000	800,000	600,000
Number of options and restricted stock units granted since inception (in shares)					7,235,184			2,182,700
Number of stock options expired or terminated since inception (in shares)					2,880,197			1,034,339
Number of restricted stock units forfeited since inception (in shares)					667,924			1,500
Stock options exercised since inception (in shares)					253,055			1,052,045
Shares of common stock issued pursuant to vested restricted stock units since inception					518,946			42,500
Number of stock options outstanding (in shares)					2,592,384			52,316
Number of restricted stock units outstanding (in shares)					322,678			0
Remaining number of shares available for future grants					1,571,831			0
Expiration term						7 years	10 years		10 years
Granted (in shares)										965,000	125,000		55,000
Award vesting period											4 years		4 years
Forfeited or expired (in shares)												101,250
Forfeited or expired (in shares)														41,250
Stock options exercised (in shares)												28,750
Vested (in shares)														33,750