Stock-Based Compensation (Tables)

3 Months Ended

Dec. 31, 2019

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		221,000		51.58
Cancelled		(15,250	)	7.67
Exercised		(472,193	)	6.36
Balance At December 31, 2019		4,507,227		$	10.48	6.1 years	$	239,071,624
Exercisable At December 31, 2019		3,185,761		$	6.69	4.8 years	$	180,745,146

Assumptions Used to Value Stock Options

The assumptions used to value stock options are as follows:

	Three Months Ended December 31,
	2019	2018
Dividend yield	—	—
Risk-free interest rate	1.4 – 1.8%	2.8 – 3.1%
Volatility	90.5 – 91.0%	115%
Expected life (in years)	6.25	6.25
Weighted average grant date fair value per share of options granted	$39.05	$11.85

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		289,575			48.26
Vested		(533,333	)		6.96
Forfeited		-			-
Unvested at December 31, 2019		1,819,075		$	16.34