Stock Compensation - Option activity (Details) - Stock Options - $ / shares	1 Months Ended	6 Months Ended	9 Months Ended
	Jul. 31, 2016	Jun. 30, 2016	Sep. 30, 2016
Shares Available For Grant
Outstanding at the beginning of the period (in shares)		3,846,717	3,846,717
Additional authorization (in shares)			5,000,000
Options granted (in shares)			(2,606,079)
Options cancelled (in shares)			164,542
Options expired (in shares)			(1,834)
Outstanding at the end of the period (in shares)			6,403,346
Shares Subject to Outstanding Options, Shares
Outstanding at the beginning of the period (in shares)		11,052,279	11,052,279
Options granted (in shares)			2,606,079
Options exercised (in shares)			(1,524,934)
Options cancelled (in shares)			(156,555)
Options expired (in shares)			(7,987)
Outstanding at the end of the period (in shares)			11,968,882
Shares Subject to Outstanding Options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)		$ 33.55	$ 33.55
Options granted (in dollars per share)			89.53
Options exercised (in dollars per share)			19.16
Options cancelled (in dollars per share)			77.13
Options expired (in dollars per share)			39.67
Outstanding at the end of the period (in dollars per share)			$ 46.99
Termination period	10 years	7 years
Vesting period	4 years	3 years
Vesting after one year
Shares Subject to Outstanding Options, Weighted Average Exercise Price
Vesting period	1 year	1 year
Vesting Percentage	25.00%	33.00%
Remainder vesting
Shares Subject to Outstanding Options, Weighted Average Exercise Price
Vesting period	36 months	24 months