Stock Option Plans and Share-Based Compensation-Narrative (Details) (USD $)	12 Months Ended					0 Months Ended	12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Equity Option [Member]	Dec. 31, 2013 Employee Stock Option [Member]	May 21, 2013 2009 Equity Incentive Plan [Member]	Dec. 31, 2013 2009 Equity Incentive Plan [Member]	Dec. 31, 2012 2009 Equity Incentive Plan [Member]	Dec. 31, 2010 2009 Equity Incentive Plan [Member]	May 19, 2009 2009 Equity Incentive Plan [Member]	Dec. 31, 2013 2009 Equity Incentive Plan [Member] Employee Stock Option [Member] VestingInstallment	Dec. 31, 2013 Employee Stock Purchase Plan [Member]	Dec. 31, 2009 Employee Stock Purchase Plan [Member]	Dec. 31, 2013 Employee Stock Purchase Plan [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized										2,100,000
Number of shares not available for grant for each share granted							1.40	1.40	0
Number of additional shares authorized						2,500,000	2,600,000						2,622,426
Award vesting period											4 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Monthly Vesting Installments After Initial Cliff											36
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period											10 years
Maximum annual contribution per employee, percent												15.00%
Maximum annual contribution per employee												$ 25,000
Purchase price of stock, percent														85.00%
Number of shares available for grant	3,060,505											1,097,998
Stock Issued During Period, Shares, Employee Stock Purchase Plans												450,713
Stock Issued Since Plan Inception, Shares Employee Stock Purchase Plans												4,233,557
Total compensation cost not yet recognized					7,100,000.00							1,176,000
Period for recognition				2 years 8 months 12 days			2 years 8 months 12 days					7 months 18 days
Maximum employee subscription rate contribution per employee, percent	75.00%
Employer matching contribution, percent	3.00%
Maximum annual contribution per employee	1,000
Cost recognized	1,100,000	800,000	600,000
Total compensation cost not yet recognized							$ 7,100,000