Stock-Based Compensation (Tables)

12 Months Ended

Sep. 30, 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, 2019		4,773,670		$	8.16
Granted		951,500		48.19
Cancelled		(74,639	)	22.38
Exercised		(1,111,128	)	6.72
Balance At September 30, 2020		4,539,403		$	16.67	6.2 years	$	129,100,277
Exercisable At September 30, 2020		2,924,744		$	8.30	4.8 years	$	102,698,309

Assumptions Used to Value Stock Options

The assumptions used to value stock options are as follows:

	Years ended September 30,
	2020		2019			2018
Dividend yield		-		-			-
Risk-free interest rate	0.4 – 1.8%		1.50-3.11%			2.05-2.99%
Volatility	90-92%			115	%		110	%
Expected life (in years)		6.25		6.25			6.25
Weighted average grant date fair value per share of options granted	$	36.35	$	13.80		$	5.04

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, 2019		2,062,833		$	9.43
Granted		2,687,096			55.59
Vested		(1,158,904	)		9.71
Forfeited		(67,000	)		31.78
Unvested at September 30, 2020		3,524,025		$	44.11