Equity Incentive Plans - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Options
Outstanding at Beginning balance	1,210,920	864,830	244,928
Options granted	707,099	571,660	725,161
Options exercised	(218,636)	(168,523)	(100,273)
Options cancelled	(34,559)	(57,047)	(4,986)
Outstanding at Ending balance	1,664,824	1,210,920	864,830
Exercisable at End of Period	346,720
Vested and expected to vest at End of Period	1,630,878
Weighted-Average Exercise Price Per Option
Outstanding at Beginning balance	$ 3.44	$ 1.80	$ 0.77
Options granted	15.68	5.24	1.99
Options exercised	1.67	1.67	0.64
Options cancelled	7.12	1.87	1.05
Outstanding at Ending balance	8.80	$ 3.44	$ 1.80
Exercisable at End of Period	3.95
Vested and expected to vest at End of Period	$ 8.76
Aggregate Value Intrinsic
Outstanding at End of period	$ 3,831	$ 20,292	$ 769
Exercisable at End of Period	1,320
Vested and expected to vest at End of Period	$ 3,777