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Stock-Based Compensation (Tables)

6 Months Ended

Mar. 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, 2019			4,773,670			$	8.16
Granted			653,500			53.78
Cancelled			(30,752	)		15.00
Exercised			(686,432	)		6.31
Balance At March 31, 2020			4,709,986			$	14.72			6.2 years		$	82,658,407
Exercisable At March 31, 2020			3,111,009			$	7.12			4.8 years		$	67,796,517

Assumptions Used to Value Stock Options

The assumptions used to value stock options are as follows:

		Six Months Ended March 31,
		2020			2019
Dividend yield		—			—
Risk-free interest rate		0.5 – 1.8%			2.3 – 3.1%
Volatility		90.5 – 91.8%			115%
Expected life (in years)		6.25			6.25
Weighted average grant date fair value per share of options granted		$40.70			$11.42

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			2,333,646				58.27
Vested			(955,404	)			9.07
Forfeited			(67,000	)			31.78
Unvested at March 31, 2020			3,374,075			$	42.87

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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-Section 50
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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