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Stock-Based Compensation (Tables)
6 Months Ended
Mar. 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, 2017

 

5,549,543

 

 

$

6.00

  

  

 

 

 

 

 

 

 

Granted

 

660,000

 

 

 

4.12

  

  

 

 

 

 

 

 

 

Cancelled

 

(124,678)

 

 

 

8.33

  

  

 

 

 

 

 

 

 

Exercised

 

(79,374)

 

 

 

2.43

  

  

 

 

 

 

 

 

 

Balance At March 31, 2018

 

6,005,491

  

 

$

5.80

  

  

 

6.4 years

 

 

$

13,719,627

 

Exercisable At March 31, 2018

 

4,244,466

 

 

$

6.49

 

 

 

5.5 years

 

 

$

8,190,872

 

 

Assumptions Used to Value Stock Options

The assumptions used to value stock options are as follows:

 

 

 

Six Months Ended March 31,

 

 

2018

 

 

2017

Dividend yield

 

 

 

Risk-free interest rate

 

2.1 – 2.7%

 

 

1.3 – 2.1%

Volatility

 

110%

 

 

79%

Expected life (in years)

 

6.25

 

 

5.75 - 6.25

Weighted average grant date fair value per share of options granted

 

$3.47

 

 

$1.36

 

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

 

(1,005,333

 

 

2.35

 

Forfeited

 

(50,000

 

 

1.55

 

Unvested at March 31, 2018

 

3,298,167

 

 

$

2.96