Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Accounting standard adoption adjustment	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Deficit Accounting standard adoption adjustment	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2017			59,663,969	(2,587,535)
Beginning Balance at Dec. 31, 2017	$ 140,063	$ 676	$ 60	$ (3)	$ 305,676	$ (163,135)	$ 676	$ (2,535)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of stock options (in shares)	3,120,000		3,120,404
Common stock issued upon exercise of stock options	$ 32,791		$ 3		32,788
Common stock issued upon vesting of restricted stock units (in shares)			361,539
Common stock issued upon vesting of restricted stock units	1		$ 1
Stock-based compensation	14,841				14,841
Bonus cash payment settled in shares of the Company's common stock	0
Common stock issued under Employee Stock Purchase Plan (in shares)			150,989
Common stock issued under Employee Stock Purchase Plan	2,480				2,480
Common stock repurchase (in shares)				(93,750)
Common stock repurchase	(1,345)				(1,345)
Issuance of common stock in connection with acquisitions (in shares)			379,328
Issuance of common stock in connection with acquisitions	8,150				8,150
Net loss	(25,032)					(25,032)
Other comprehensive income (loss)	(1,896)							(1,896)
Ending Balance (in shares) at Dec. 31, 2018			63,676,229	(2,681,285)
Ending Balance at Dec. 31, 2018	$ 170,729		$ 64	$ (3)	362,590	(187,491)		(4,431)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of stock options (in shares)	1,523,000		1,523,018
Common stock issued upon exercise of stock options	$ 16,918		$ 2		16,916
Common stock issued upon vesting of restricted stock units (in shares)			1,197,576
Common stock issued upon vesting of restricted stock units	1,000		$ 1		999
Stock-based compensation	25,083				25,083
Bonus cash payment settled in shares of the Company's common stock	0
Common stock issued under Employee Stock Purchase Plan (in shares)			146,250
Common stock issued under Employee Stock Purchase Plan	4,142				4,142
Common stock repurchase (in shares)				(28,545)
Common stock repurchase	(903)				(903)
Equity component of convertible senior notes	52,900				52,900
Equity component of convertible senior notes issuance costs	(1,986)				(1,986)
Purchase of capped call option	(23,184)				(23,184)
Net loss	(96,071)					(96,071)
Other comprehensive income (loss)	(93)							(93)
Ending Balance (in shares) at Dec. 31, 2019			66,543,073	(2,709,830)
Ending Balance at Dec. 31, 2019	$ 148,535	$ (729)	$ 67	$ (3)	436,557	(283,562)	$ (729)	(4,524)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of stock options (in shares)	1,683,000		1,683,315
Common stock issued upon exercise of stock options	$ 21,354		$ 1		21,353
Common stock issued upon vesting of restricted stock units (in shares)			915,827
Common stock issued upon vesting of restricted stock units	$ 1		$ 1
Common stock as earnout payment in connection with AdvantageTec Inc. (in shares)	11,508		11,508
Common stock as earnout payment in connection with AdvantageTec Inc.	$ 293				293
Stock-based compensation	$ 36,132				36,132
Bonus cash payment settled in shares of the Company's common stock (in shares)	991,905		991,905
Bonus cash payment settled in shares of the Company's common stock	$ 24,657		$ 1		24,656
Common stock issued under Employee Stock Purchase Plan (in shares)			118,637
Common stock issued under Employee Stock Purchase Plan	4,002				4,002
Equity component of convertible senior notes	162,534				162,534
Equity component of convertible senior notes issuance costs	(3,797)				(3,797)
Purchase of capped call option	(46,058)				(46,058)
Net loss	(107,594)					(107,594)
Other comprehensive income (loss)	4,604							4,604
Ending Balance (in shares) at Dec. 31, 2020			70,264,265	(2,709,830)
Ending Balance at Dec. 31, 2020	$ 243,934		$ 70	$ (3)	$ 635,672	$ (391,885)		$ 80