Stock-Based Compensation (Tables)

12 Months Ended

Sep. 30, 2018

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, 2017		5,549,543	$	6.00
Granted		822,000		5.97
Cancelled		(242,533)		6.83
Exercised		(604,611)		4.39
Balance At September 30, 2018		5,524,399	$	6.14		6.0 years	$	72,152,284
Exercisable At September 30, 2018		3,998,427	$	6.62		5.1 years	$	50,361,428

Assumptions Used to Value Stock Options

The assumptions used to value stock options are as follows:

	Years ended September 30,
	2018	2017	2016
Dividend yield	—	—	—
Risk-free interest rate	2.05 – 2.99%	1.34 – 2.31%	1.05 – 1.89%
Volatility	110%	79%	89%
Expected life (in years)	6.25	5.85	6.25
Weighted average grant date fair value per share of options granted	$5.04	$1.33	$4.58

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, 2017		3,108,000		$	2.45
Granted		1,245,500			3.68
Vested		(1,335,000	)		2.43
Forfeited		(50,000	)		1.55
Unvested at September 30, 2018		2,968,500		$	2.99