Stock-Based Compensation (Tables)

12 Months Ended

Sep. 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		(217,820	)	40.12
Exercised		(1,051,344	)	10.75
Balance At September 30, 2021		3,456,239		$	19.60	5.56	$	149,501,055
Exercisable At September 30, 2021		2,510,091		$	12.23	4.58	$	126,302,948

Assumptions Used to Value Stock Options

The assumptions used to value stock options are as follows:

	Years ended September 30,
	2021		2020		2019
Dividend yield		-		-		-
Risk-free interest rate	0.4 – 1.1%		0.4 – 1.8%		1.50 – 3.1%
Volatility	86.2 – 90.4%		90.0 – 92.0%		115%
Expected life (in years)		6.25		6.25		6.25
Weighted average grant date fair value per share of    options granted	$	48.64	$	36.35	$	13.80

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		1,672,350			76.34
Vested		(899,025	)		30.65
Forfeited		(465,500	)		44.91
Unvested at September 30, 2021		3,831,850		$	61.24