Segment and Geographic Information - Net Revenues Based upon Source of Order by Geographic Area - Tabular Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 145,544	$ 129,535	$ 285,196	$ 247,677
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	94,283	79,753	184,366	153,302
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	26,554	29,514	55,149	55,403
CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	13,757	11,736	26,798	22,791
Asia / Pacific/ Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 10,950	$ 8,532	$ 18,883	$ 16,181