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Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue      
Total revenue $ 98,382 $ 85,071 $ 55,663
Operating expenses      
Cost of revenue 22,530 22,274 19,668
Research and development 116,072 70,705 39,157
Sales and marketing 61,358 38,453 24,486
General and administrative 49,536 30,332 20,409
Amortization of intangible assets 1,703 1,698 1,699
Total operating expenses 251,199 163,462 105,419
Loss from operations (152,817) (78,391) (49,756)
Interest and other income, net 6,590 9,785 3,309
Net loss (146,227) (68,606) (46,447)
Fair value adjustment to Series E-1 convertible preferred stock options   (964) 102
Net loss attributable to common shareholders $ (146,227) $ (69,570) $ (46,345)
Net loss per share attributable to common shareholders, basic and diluted $ (1.11) $ (1.01) $ (3.67)
Weighted-average shares used in computing net loss per share attributable to common shareholders, basic and diluted 131,216,468 69,165,315 12,629,778
Sequencing Revenue      
Revenue      
Total revenue $ 41,439 $ 43,519 $ 32,978
Development Revenue      
Revenue      
Total revenue $ 56,943 $ 41,552 $ 22,685