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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2016
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, 2015

 

5,435,640

 

 

$

6.71

  

  

 

 

 

 

 

 

 

Granted

 

1,402,000

 

 

 

6.12

  

  

 

 

 

 

 

 

 

Cancelled

 

(109,253)

 

 

 

9.63

  

  

 

 

 

 

 

 

 

Exercised

 

(37,187)

 

 

 

3.60

  

  

 

 

 

 

 

 

 

Balance At September 30, 2016

 

6,691,200

  

 

$

6.56

  

  

 

7.3 years

 

 

$

12,794,064

 

Exercisable At September 30, 2016

 

3,850,419

 

 

$

6.22

 

 

 

6.5 years

 

 

$

9,265,570

 

 
Assumptions Used to Value Stock Options

The assumptions used to value stock options are as follows:

 

 

 

 

Years ended September 30,

 

 

2016

 

2015

 

2014

Dividend yield

 

—

 

—

 

—

Risk-free interest rate

 

1.05 – 1.89%

 

1.46 – 1.89%

 

1.8 – 2.4%

Volatility

 

89%

 

75%

 

69%

Expected life (in years)

 

6.25

 

6 - 6.25

 

6.25 – 9.47

Weighted average grant date fair value per share of options granted

 

$4.58

 

$4.24

 

$8.92

 
Summary of Share Activity Related to Restricted Stock Units

The following table summarizes the activity of the Company’s Restricted Stock Units:

 

 

Number of
RSUs

 

 

Weighted-
Average
Grant
Date
Fair Value

 

Unvested at September 30, 2015

 

934,167

  

 

$

9.18

 

Granted

 

838,517

 

 

 

6.15

 

Vested

 

(416,017

) 

 

 

11.08

 

Forfeited

 

—

 

 

 

—

 

Unvested at September 30, 2016

 

1,356,667

 

 

$

6.72