Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue:
Total revenue	$ 68,728	$ 56,511	$ 179,167	$ 150,539
Cost of revenue	46,643	32,120	130,017	81,380
Research and development	37,802	46,951	168,433	90,247
Selling and marketing	37,800	32,690	119,440	87,662
General and administrative	27,306	21,733	81,966	56,326
Loss from operations	(80,823)	(76,983)	(320,689)	(165,076)
Other expense, net	(15,771)	(7,591)	(32,499)	(5,572)
Interest expense	(6,308)	(2,833)	(17,244)	(7,062)
Net loss before taxes	(102,902)	(87,407)	(370,432)	(177,710)
Income tax benefit	0	(8,700)	(2,600)	(12,650)
Net loss	$ (102,902)	$ (78,707)	$ (367,832)	$ (165,060)
Net loss per share, basic and diluted (in dollars per share)	$ (0.78)	$ (0.82)	$ (3.08)	$ (1.86)
Shares used in computing net loss per share, basic and diluted	132,484	95,577	119,386	88,663
Test revenue
Revenue:
Total revenue	$ 67,326	$ 55,502	$ 175,503	$ 147,423
Other revenue
Revenue:
Total revenue	$ 1,402	$ 1,009	$ 3,664	$ 3,116