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Equity and Stock-based Compensation (Tables)
 3 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Share-based Compensation, Stock Options, Activity
The following table summarizes our stock option activity during the three months ended December 31, 2017:
 
 
Options
 
Weighted
Average
Exercise
Price
Outstanding at beginning of period
1,560,441

 
$
7.95

Granted
—

 
—

Exercised
(165,839
)
 
7.03

Forfeited
(27,299
)
 
20.04

Outstanding at end of period
1,367,303

 
$
7.82

 
 
 
 
Exercisable at end of period
1,142,012

 
$
8.06

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