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Equity and Stock-based Compensation (Tables)
 6 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Share-based Compensation, Stock Options, Activity
The following table summarizes our stock option activity during the six months ended March 31, 2018:
 
 
Options
 
Weighted Average Exercise Price
Outstanding at beginning of period
1,560,441

 
$
7.95

Granted
—

 
—

Exercised
(185,413
)
 
7.07

Forfeited
(35,239
)
 
17.79

Outstanding at end of period
1,339,789

 
$
7.81

 
 
 
 
Exercisable at end of period
1,137,748

 
$
8.04

Weighted average fair value of options granted during the period
$
—