Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Accumulated deficit
Balance (in shares) at Dec. 31, 2017		28,146,162
Balance at Dec. 31, 2017	$ 114,642	$ 28	$ 223,868	$ 136	$ (109,390)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	34,961		34,961
Common stock issued under employee stock plans, net (in shares)		1,430,718
Common stock issued under employee stock plans, net	8,114	$ 2	8,112
Realized and unrealized gains (losses) on derivative	(3,790)			(3,790)
Unrealized gains (losses) in available for sale securities	21			21
Net loss	(28,578)				(28,578)
Balance (in shares) at Dec. 31, 2018		29,576,880
Balance at Dec. 31, 2018	125,370	$ 30	266,941	(3,633)	(137,968)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	46,139		46,139
Common stock issued under employee stock plans, net (in shares)		1,006,431
Common stock issued under employee stock plans, net	(2,397)	$ 1	(2,398)
Realized and unrealized gains (losses) on derivative	3,158			3,158
Unrealized gains (losses) in available for sale securities	26			26
Net loss	(78,764)				(78,764)
Balance (in shares) at Dec. 31, 2019		30,583,311
Balance at Dec. 31, 2019	93,532	$ 31	310,682	(449)	(216,732)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	68,585		68,585
Common stock issued under employee stock plans, net (in shares)		1,200,001
Common stock issued under employee stock plans, net	9,791	$ 1	9,790
Issuance of common stock from acquisitions	4,198	$ 0	4,198
Issuance of common stock from acquisitions (in shares)		35,642
Fair value of replacement equity awards attributable to pre-acquisition service	709		709
Realized and unrealized gains (losses) on derivative	9,838			9,838
Unrealized gains (losses) in available for sale securities	(18)			(18)
Purchase of capped calls related to Convertible senior notes	(29,348)		(29,348)
Equity component of Convertible senior notes, net	30,794		30,794
Net loss	(94,010)				(94,010)
Balance (in shares) at Dec. 31, 2020		31,818,954
Balance at Dec. 31, 2020	$ 94,071	$ 32	$ 395,410	$ 9,371	$ (310,742)