Stock-Based Compensation (Tables)

9 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summarized Information about Stock Options

The following table summarizes information about stock options:

	Number of Options Outstanding			Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value
Balance at September 30, 2020		4,539,403		$	16.67
Granted		186,000		65.57
Cancelled		(167,609	)	34.86
Exercised		(981,219	)	10.69
Balance at June 30, 2021		3,576,575		$	20.00	5.9 years	$	224,666,017
Exercisable at June 30, 2021		2,417,915		$	11.18	4.7 years	$	173,212,122

Assumptions Used to Value Stock Options

The assumptions used to value stock options are as follows:

	Nine Months Ended June 30,
	2021		2020
Dividend yield		-		-
Risk-free interest rate	0.4 – 1.1%		0.4 – 1.8%
Volatility	86.2 – 90.4%		90.5 – 91.9%
Expected life (in years)		6.25		6.25
Weighted average grant date fair value per share of options granted	$	48.64	$	38.12

Summary of Share Activity Related to RSUs

The following table summarizes the activity of the Company’s RSUs:

	Number of RSUs			Weighted- Average Grant Date Fair Value
Unvested at September 30, 2020		3,524,025		$	44.11
Granted		1,488,450			75.29
Vested		(851,825	)		30.41
Forfeited		(315,000	)		39.93
Unvested at June 30, 2021		3,845,650		$	59.55