Stockholder's Equity and Stock Based Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Feb. 28, 2014 Employee Stock Purchase Plan	Jun. 30, 2014 Employee Stock Purchase Plan	Jun. 30, 2014 Employee Stock Purchase Plan	Jun. 30, 2014 Employee Stock Purchase Plan Minimum	Jun. 30, 2014 Employee Stock Purchase Plan Minimum	Jun. 30, 2014 Employee Stock Purchase Plan Maximum	Jun. 30, 2014 Employee Stock Purchase Plan Maximum	Jun. 30, 2014 Stock options	Jun. 30, 2013 Stock options	Jun. 30, 2014 Stock options	Jun. 30, 2013 Stock options	Jun. 30, 2014 Stock options Minimum	Jun. 30, 2013 Stock options Minimum	Jun. 30, 2014 Stock options Minimum	Jun. 30, 2013 Stock options Minimum	Jun. 30, 2014 Stock options Maximum	Jun. 30, 2013 Stock options Maximum	Jun. 30, 2014 Stock options Maximum	Jun. 30, 2013 Stock options Maximum	Jun. 30, 2014 RSUs	Jun. 30, 2013 RSUs	Jun. 30, 2014 RSUs Minimum	Jun. 30, 2014 RSUs Maximum
Assumptions used for estimation of fair value
Expected term				6 months	6 months	9 months	9 months	6 years	6 years	6 years	6 years
Risk-free interest rate (as a percent)				0.08%	0.08%	0.11%	0.11%					1.90%	0.86%	1.84%	0.86%	1.97%	1.375%	1.97%	1.375%
Expected volatility (as a percent)				41.00%	41.00%	42.00%	42.00%					49.00%	57.00%	49.00%	57.00%	55.00%	58.00%	56.00%	58.00%
Expected dividend rate (as a percent)		0.00%	0.00%					0.00%	0.00%	0.00%	0.00%
Number of RSUs
Balance at the beginning of the period (in shares)																				582,000
RSUs Granted (in shares)																				1,136,000
RSUs Vested (in shares)																				(137,000)
RSUs Cancelled/Forfeited (in shares)																				(68,000)
Balance at the end of the period (in shares)																				1,513,000
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)																				$ 22.57
RSUs Granted (in dollars per share)																				$ 38.29	$ 15.10
RSUs Vested (in dollars per share)																				$ 5.88
RSUs Cancelled/Forfeited (in dollars per share)																				$ 38.35
Balance at the end of the period (in dollars per share)																				$ 35.19
Period
Balance at the beginning of the period (in dollars)																				$ 21,579
Balance at the end of the period (in dollars)																				43,988
Vesting period										4 years												3 years	4 years
RSUs Granted (in dollars per share)																				$ 38.29	$ 15.10
Total intrinsic value of vested RSUs																				$ 4,237	$ 6,383
Issuance of common stock under employee stock purchase plan	300,000
Purchase price of Employee Stock Purchase Plan Shares	$ 11.05																			$ 29.08