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Equity and Stock-based Compensation (Notes)
 3 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Equity and Stock-based Compensation
Equity and Stock-Based Compensation
 
Stock-based compensation expense was $0.3 million in both the three months ended December 31, 2017 and 2016, and is included in selling, general and administrative expenses.

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
$
—