Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Class of Stock and Related Party Balances [Line Items]
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	1,500,000,000	1,500,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Royalty receivables	$ 129	$ 119
Related party operating lease, asset	1,492	1,629
Related party operating lease, liabilities, current	449	431
Related party operating lease, liabilities, noncurrent	$ 1,043	$ 1,198
Class A Common Stock
Class of Stock and Related Party Balances [Line Items]
Common stock par or stated value per share	$ 0.001	$ 0.001
Common stock shares authorized	3,000,000,000	3,000,000,000
Common stock, shares issued (in shares)	52,834,735	52,533,388
Common stock, shares outstanding (in shares)	52,834,735	52,533,388
Class B Common Stock
Class of Stock and Related Party Balances [Line Items]
Common stock par or stated value per share	$ 0.00001	$ 0.00001
Common stock shares authorized	1,500,000,000	1,500,000,000
Common stock, shares issued (in shares)	234,609,825	233,572,370
Common stock, shares outstanding (in shares)	234,609,825	233,572,370