Shareholders' Equity - Summary of Changes of Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Class Of Stock [Line Items]
Beginning balance	$ 463,722	$ 109,553
Impact of adoption of new accounting pronouncements - ASC 606 (see Note 2)		27,622
Exercise of stock options	$ 7,928	27,311
Exercise of stock options, Shares	532,848
Shares tendered for cashless redemption of stock options		(93)
Stock-based compensation cost	$ 9,749	6,571
Shares issued under employee stock purchase plan	5,716	7,664
Shares issued related to business combination earnouts	3,750
Shares issued to purchase intangible assets	87	50
Gain (Loss) on translation adjustment	625	(462)
Net loss	(15,283)	(10,354)
Ending balance	476,294	167,862
Common Stock
Class Of Stock [Line Items]
Beginning balance	$ 8	$ 7
Beginning balance, Shares	77,447,620	66,768,563
Exercise of stock options, Shares	532,848	2,763,291
Vesting of restricted stock units	186,475
Shares tendered for cashless redemption of stock-based awards, Shares		(2,805)
Shares issued under employee stock purchase plan, Shares	81,894	372,764
Shares issued related to business combination earnouts, Shares	44,659
Shares issued to purchase intangible assets, Shares	1,191	1,634
Ending balance	$ 8	$ 7
Ending balance, Shares	78,294,687	69,903,447
Additional Paid-In Capital
Class Of Stock [Line Items]
Beginning balance	$ 976,627	$ 599,493
Exercise of stock options	7,928	27,311
Shares tendered for cashless redemption of stock options		(93)
Stock-based compensation cost	9,749	6,571
Shares issued under employee stock purchase plan	5,716	7,664
Shares issued related to business combination earnouts	3,750
Shares issued to purchase intangible assets	87	50
Ending balance	1,003,857	640,996
Accumulated Other Comprehensive Income (Loss)
Class Of Stock [Line Items]
Beginning balance	(2,719)	(2,345)
Gain (Loss) on translation adjustment	625	(462)
Ending balance	(2,094)	(2,807)
Accumulated Deficit
Class Of Stock [Line Items]
Beginning balance	(510,194)	(487,602)
Impact of adoption of new accounting pronouncements - ASC 606 (see Note 2)		27,622
Net loss	(15,283)	(10,354)
Ending balance	$ (525,477)	$ (470,334)