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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Consolidated Statements of Operations and Comprehensive Loss      
Revenues $ 132,333 $ 90,100 $ 54,385
Operating expenses:      
Cost of revenues 80,620 61,406 47,426
Research and development 69,072 43,006 35,683
Selling, general and administrative 135,901 103,267 80,126
Change in fair value of contingent consideration and indemnity holdback (534)    
Litigation settlement   22,500  
Total operating expenses 285,059 230,179 163,235
Loss from operations (152,726) (140,079) (108,850)
Interest income 435 1,499 3,032
Interest expense (367) (787) (1,294)
Other income (expense), net (1,370) (182) (265)
Loss before income taxes (154,028) (139,549) (107,377)
Benefit from (provision for) income taxes 1,930 (382) (292)
Net loss attributable to common stockholders (152,098) (139,931) (107,669)
Other comprehensive loss:      
Change in unrealized gain (loss) on investments (14) (34) 49
Foreign currency translation adjustment 473 (60) 45
Comprehensive loss $ (151,639) $ (140,025) $ (107,575)
Net loss per share attributable to common stockholders-basic and diluted (in dollars per share) $ (3.15) $ (3.57) $ (3.92)
Weighted average shares used in computing net loss per share attributable to common stockholders (in shares) 48,251 39,190 27,462