Stock-Based Compensation (Details) - Jun. 30, 2015 - Options to purchase common stock - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Total	Total
Summary of stock option activity - Shares
Options outstanding at the beginning of the period (in shares)		3,220
Granted (in shares)		655
Exercised (in shares)		(49)
Cancelled (in shares)		(26)
Options outstanding at the end of the period (in shares)	3,800	3,800
Options exercisable at the end of the period (in shares)	1,547	1,547
Options vested and expected to vest at the end of the period (in shares)	3,690	3,690
Summary of stock option activity - Weighted-Average Exercise Price (in dollars per share)
Options outstanding at the beginning of the period (in dollars per share)		$ 13.58
Granted (in dollars per share)		43.09
Exercised (in dollars per share)		7.37
Cancelled (in dollars per share)		13.54
Options outstanding at the end of the period (in dollars per share)	$ 18.74	18.74
Options exercisable at the end of the period (in dollars per share)	9.70	9.70
Options vested and expected to vest at the end of the period (in dollars per share)	$ 18.56	$ 18.56
Weighted-Average Contractual Life (In Years)
Options outstanding at the end of the period		8 years 4 months 13 days
Options exercisable at the end of the period		7 years 1 month 2 days
Options vested and expected to vest at the end of the period		8 years 4 months 2 days
Aggregate Intrinsic Value
Options outstanding at the end of the period (in dollars)	$ 186,048	$ 186,048
Options exercisable at the end of the period (in dollars)	89,751	89,751
Options vested and expected to vest at the end of the period (in dollars)	$ 181,355	$ 181,355
Additional disclosures
Weighted-average grant-date fair value (in dollars per share)	$ 19.14	$ 22.99