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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Stock option activity Stock option activity was as follows (shares in thousands):
 
Options Outstanding
 
Weighted-
Average
Exercise
Price
Outstanding at December 31, 2017
297

 
$
5.37

Forfeited, canceled or expired
(4
)
 
17.48

Exercised
(127
)
 
2.89

Outstanding at December 31, 2018
166

 
$
6.97

Stock options outstanding Certain information regarding options outstanding at December 31, 2018 was as follows:
 
Options Outstanding
 
Options Exercisable
 
Options Vested and Expected to Vest
Number (in thousands)
166

 
166

 
166

Weighted-average exercise price
$
6.97

 
$
6.97

 
$
6.97

Aggregate intrinsic value (in thousands)
$
698

 
$
698

 
$
698

Weighted average remaining contractual term (in years)
1.8

 
1.8

 
1.8

RSU activity Compensation expense for RSAs is recognized over the estimated vesting period. Following is a summary of RSA activity (shares in thousands):
 
RSAs Outstanding
 
Weighted-
Average
Grant Date Fair Value per Share
Outstanding at December 31, 2017
47

 
$
16.28

Granted
20

 
14.65

Vested
(17
)
 
17.60

Outstanding at December 31, 2018
50

 
$
15.18


Following is a summary of RSU activity (shares in thousands):
 
RSUs Outstanding
 
Weighted-
Average
Grant Date Fair Value per Share
Outstanding at December 31, 2017
191

 
$
17.64

Granted
254

 
12.06

Forfeited, canceled or expired
(32
)
 
15.55

Vested
(45
)
 
17.57

Outstanding at December 31, 2018
368

 
$
13.98

PSU activity Following is a summary of PSU activity (shares in thousands):
 
PSUs Outstanding
 
Weighted-
Average
Grant Date Fair Value per Share
Outstanding at December 31, 2017
172

 
$
17.65

Granted and additional goal shares awarded
124

 
12.13

Forfeited, canceled or expired
(25
)
 
15.26

Vested
(50
)
 
17.61

Outstanding at December 31, 2018
221

 
$
14.73

Stock-based compensation Stock-based compensation expense, primarily included in general and administrative expense, was as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Stock options
$
6

 
$
84

 
$
389

RSAs
292

 
287

 
168

RSUs
1,527

 
954

 
734

PSUs
52

 
408

 
1,211

ESPP
104

 
123

 
111

 
$
1,981

 
$
1,856

 
$
2,613

Other information regarding stock-based compensation Certain other information regarding our stock-based compensation was as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Total intrinsic value of stock options exercised
$
1,451

 
$
1,522

 
$
1,221

Fair value of RSUs vested
655

 
28

 
311

Fair value of PSUs vested
614

 
2,036

 
574

ESPP Activity ESPP activity was as follows (shares in thousands):
 
Shares Available for Issuance
 
Weighted-
Average
Purchase Price
 
Weighted-Average Discount per Share
Balance at December 31, 2017
432

 
 
 
 
Employee shares purchased
(38
)
 
$
11.55

 
$
2.71

Balance at December 31, 2018
394

 
 
 
 
Assumptions Assumptions used in calculating the fair value of employee stock purchases were as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
Dividend yield
—%
 
—%
 
—%
Risk-free interest rate
1.7%
 
0.8%
 
0.4%
Expected life (years)
N/A
 
N/A
 
N/A
Expected volatility
40%
 
44%
 
56%