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Stock-Based Compensation (Tables)
 3 Months Ended
Dec. 31, 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, 2018

 

 

5,524,399

 

 

$

6.14

 

 

 

 

 

 

 

Granted

 

 

47,000

 

 

13.73

 

 

 

 

 

 

 

Cancelled

 

 

—

 

 

—

 

 

 

 

 

 

 

Exercised

 

 

(166,327

)

 

6.04

 

 

 

 

 

 

 

Balance At December 31, 2018

 

 

5,405,072

 

 

$

6.21

 

 

5.8 years

 

$

35,651,163

 

Exercisable At December 31, 2018

 

 

3,686,534

 

 

$

6.50

 

 

4.9 years

 

$

24,853,606

 
Assumptions Used to Value Stock Options

The assumptions used to value stock options are as follows:

 

 

 

Three Months Ended December 31,

 

 

2018

 

 

2017

Dividend yield

 

—

 

 

—

Risk-free interest rate

 

2.75 – 3.11%

 

 

2.05 – 2.22%

Volatility

 

115%

 

 

110%

Expected life (in years)

 

6.25

 

 

6.25

Weighted average grant date fair value per share of options granted

 

$11.85

 

 

$3.03
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, 2018

 

 

2,968,500

 

 

$

2.99

 

Granted

 

 

3,459

 

 

 

13.73

 

Vested

 

 

(658,959

)

 

 

4.29

 

Forfeited

 

 

—

 

 

 

—

 

Unvested at December 31, 2018

 

 

2,313,000

 

 

$

2.64