Fair Value Measurements - Assumptions (Details)	Sep. 30, 2022 Y $ / shares	Sep. 30, 2021 $ / shares Y
Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant inputs	4.23	0.62
Remaining contractual term of warrants (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant inputs | Y	2.4	3.4
Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant inputs	92.5	124.7
Fair value of common stock (per share)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant inputs | $ / shares	1.22	2.17