Equity Incentive Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Shares
Options outstanding, Beginning Balance, Shares	1,211
Options granted, Shares	461
Options exercised, Shares	(195)
Options forfeited/canceled/expired, Shares	(19)
Options outstanding, Ending Balance, Shares	1,458	1,211
Options vested and expected to vest, ending balance, Shares	1,346
Options exercisable, ending balance, Shares	698
Wtd. Avg. Exercise Price
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price (in dollars per share)	$ 20.65
Options granted, Wtd. Avg. Exercise Price (in dollars per share)	32.27
Options exercised, Wtd. Avg. Exercise Price (in dollars per share)	19.87
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price (in dollars per share)	24.43
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price (in dollars per share)	24.38	$ 20.65
Options vested and expected to vest, ending balance, Wtd. Avg. Exercise Price (in dollars per share)	24.08
Options exercisable, ending balance, Wtd. Avg. Exercise Price (in dollars per share)	$ 21.24
Options, Additional Disclosures
Options outstanding, Remaining Contractual Term	7 years 10 months 35 days	7 years 1 month 21 days
Options vested and expected to vest, ending balance, Wtd. Avg., Remaining Contractual Term	7 years 9 months 25 days
Options exercisable, ending balance, Wtd. Avg. Remaining Contractual Term	6 years 7 months 17 days
Options outstanding, Aggregate Intrinsic Value	$ 10,143	$ 5,466
Options vested and expected to vest, ending balance, Aggregate Intrinsic Value	9,729
Options exercisable, ending balance, Aggregate Intrinsic Value	$ 6,872