Stock-Based Compensation (Tables)

3 Months Ended

Dec. 31, 2020

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		144,000		63.64
Cancelled		(55,438	)	24.48
Exercised		(537,612	)	9.49
Balance at December 31, 2020		4,090,353		$	19.16	6.3 years	$	235,465,861
Exercisable at December 31, 2020		2,556,040		$	9.56	4.8 years	$	171,695,135

Assumptions Used to Value Stock Options

The assumptions used to value stock options are as follows:

	Three Months Ended December 31,
	2020		2019
Dividend yield		-		-
Risk-free interest rate	0.4 – 0.6%		1.4 - 1.8%
Volatility	90.0-90.4%		90.5-91.0%
Expected life (in years)		6.25		6.25
Weighted average grant date fair value per share of options granted	$	47.34	$	39.05

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		118,200			62.26
Vested		(280,325	)		22.92
Forfeited		(213,750	)		41.34
Unvested at December 31, 2020		3,148,150		$	46.87