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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Options and Awards
 
December 31,
 
2017
Common stock shares available for grant
3,254,051

Standard and market condition based stock options outstanding
3,550,072

Restricted stock awards outstanding
44,538

Restricted stock units outstanding
508,880
Schedule of Employee Stock Purchase Plan
The intrinsic value listed below is calculated as the difference between the market value on the date of purchase and the purchase price of the shares.
 
Year Ended December 31, 2017
Shares purchased under ESPP
48,750

Average price of shares purchased under ESPP
$
6.74

Intrinsic value of shares purchased under ESPP
$
136,000
Schedule of Standard and Market-based Stock Options Activity
The following table sets forth the summary of the market condition based option activity under the Company’s stock option plans for the years ended December 31, 2017, 2016 and 2015.
 
Number
of Shares    
 
Weighted
Average
Exercise
Price    
 
Weighted
Average
Fair Value
Of Options Granted    
 
Aggregate
Intrinsic
Value
of Options Exercised (In thousands)  
Outstanding at January 1, 2015
50,000

 
$
11.94

 
 
 
 
Granted
150,000

 
8.09

 
3.64

 
 
Exercised
—

 


 
 
 

Forfeited
—

 


 
 
 
 
Expired
—

 


 
 
 
 
Outstanding at December 31, 2015
200,000

 
9.05

 
 
 
 
Granted
75,000

 
9.00

 
3.68

 
 
Exercised
—

 
 
 
 
 
 
Forfeited
(50,000
)
 
11.94

 
 
 
 
Expired
—

 
 
 
 
 
 
Outstanding at December 31, 2016
225,000

 
8.39

 
 
 
 
Granted
120,830

 
8.65

 
3.12

 
 
Exercised
—

 


 
 
 

Forfeited
(73,749
)
 
8.64

 
 
 
 
Expired
—

 


 
 
 
 
Outstanding at December 31, 2017
272,081

 
8.44

 
 
 
 
The following table sets forth the summary of standard stock option activity under the Company’s stock option plans for the years ended December 31, 2017, 2016, and 2015:
 
Number of Shares
 
Weighted
Average
Exercise Price
 
Weighted
Average
Fair Value
Of Options Granted
 
Aggregate
Intrinsic
Value
of Options
Exercised
(In thousands)
Outstanding at January 1, 2015
3,486,157

 
$
8.30

 
 
 
 
Granted
525,840

 
10.15

 
$
4.56

 
 
Exercised
(239,071
)
 
6.82

 
 
 
$
1,186

Forfeited
(116,425
)
 
12.38

 
 
 
 
Expired
(59,968
)
 
13.75

 
 
 
 
Outstanding at December 31, 2015
3,596,533

 
8.45

 
 
 
 
Granted
815,794

 
7.85

 
3.67

 
 
Exercised
(395,515
)
 
6.48

 
 
 
918

Forfeited
(344,541
)
 
9.05

 
 
 
 
Expired
(251,150
)
 
8.87

 
 
 
 
Outstanding at December 31, 2016
3,421,121

 
8.44

 
 
 
 
Granted
489,568

 
8.48

 
3.82

 
 
Exercised
(70,608
)
 
7.34

 
 
 
151

Forfeited
(361,687
)
 
9.11

 
 
 
 
Expired
(200,403
)
 
15.04

 
 
 
 
Outstanding at December 31, 2017
3,277,991

 
7.99

 
 
 
 
Schedule of Information Regarding Standard and Market Condition Based Stock Options Outstanding
Information regarding standard stock options outstanding at December 31, 2017, 2016, and 2015 is summarized below:
 
Number of
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life (years)
 
Aggregate
Intrinsic
Value
(In millions)
December 31, 2015
 
 
 
 
 
 
 
Options outstanding
3,596,533

 
$
8.45

 
4.23
 
$
12.5

Options vested and expected to vest using estimated forfeiture rates
3,452,487

 
8.36

 
4.16
 
12.3

Options exercisable
2,252,744

 
7.59

 
3.56
 
9.9

December 31, 2016
 
 
 
 
 
 
 
Options outstanding
3,421,121

 
$
8.44

 
3.99
 
$
9.0

Options vested and expected to vest using estimated forfeiture rates
3,223,919

 
8.43

 
3.87
 
8.5

Options exercisable
2,131,268

 
8.22

 
3.10
 
6.4

December 31, 2017
 
 
 
 
 
 
 
Options outstanding
3,277,991

 
$
7.99

 
2.88
 
$
2.2

Options vested and expected to vest using estimated forfeiture rates
3,175,002

 
7.99

 
2.78
 
2.2

Options exercisable
2,633,990

 
7.94

 
2.14
 
2.1

Information regarding these market condition based stock options outstanding at December 31, 2017, 2016 and 2015 is summarized below:
 
Number
of Shares    
 
Weighted
Average
Exercise
Price    
 
Weighted
Average
Remaining
Contractual Life (years)     
 
Aggregate
Intrinsic
Value (In millions)  
December 31, 2015
 
 
 
 
 
 
 
Options outstanding
200,000

 
$
9.05

 
5.92
 
$
0.5

Options vested and expected to vest using estimated forfeiture rates
184,125

 
9.12

 
5.90
 
0.5

Options exercisable
—

 
—

 
0.00
 
—

December 31, 2016
 
 
 
 
 
 
 
Options outstanding
225,000

 
$
8.39

 
5.50
 
$
0.5

Options vested and expected to vest using estimated forfeiture rates
209,141

 
8.38

 
5.49
 
0.5

Options exercisable
65,625

 
8.09

 
5.17
 
0.2

December 31, 2017
 
 
 
 
 
 
 
Options outstanding
272,081

 
$
8.44

 
1.91
 
$
—

Options vested and expected to vest using estimated forfeiture rates
272,081

 
8.44

 
1.91
 
—

Options exercisable
272,081

 
8.44

 
1.91
 
—
Additional Information Regarding Options Outstanding
Additional information regarding standard options outstanding as of December 31, 2017 is as follows:
 
 
Options Outstanding
 
Options Exercisable
Range of
Exercise
  Prices
 
Number
Outstanding
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Weighted
Average
Exercise
Price
 
Number
Exercisable
 
Weighted
Average
Exercise
Price
$3.72 - $3.72
 
938

 
1.54
 
$
3.72

 
938

 
$
3.72

3.85 - 3.85
 
600,000

 
1.87
 
3.85

 
600,000

 
3.85

4.95 - 6.66
 
374,068

 
4.13
 
6.34

 
263,312

 
6.23

6.86 - 8.09
 
405,525

 
4.66
 
7.82

 
206,030

 
7.83

8.13 - 8.65
 
386,949

 
4.00
 
8.54

 
196,434

 
8.56

8.70 - 9.19
 
378,506

 
2.51
 
9.04

 
279,659

 
9.10

9.20 - 9.20
 
44,300

 
0.54
 
9.20

 
44,300

 
9.20

9.53 - 9.53
 
734,000

 
1.97
 
9.53

 
734,000

 
9.53

9.61 - 12.48
 
336,414

 
2.64
 
11.82

 
292,026

 
11.92

12.49 - 14.02
 
17,291

 
1.02
 
13.74

 
17,291

 
13.74

$3.72 - $14.02
 
3,277,991

 
2.88
 
$
7.99

 
2,633,990

 
$
7.94

Additional information regarding market condition based stock options outstanding as of December 31, 2017 is as follows:
 
Options Outstanding
 
Options Exercisable
Range of
Exercise
Prices
Number
Outstanding
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Weighted
Average
Exercise
Price
 
Number
Exercisable
 
Weighted
Average
Exercise
Price
$8.09 - $8.09
135,000

 
1.91
 
$
8.09

 
135,000

 
$
8.09

  8.65 - 8.65
84,581

 
1.91
 
8.65

 
84,581

 
8.65

  9.00 - 9.00
52,500

 
1.91
 
9.00

 
52,500

 
9.00

$8.09 - $9.00
272,081

 
1.91
 
$
8.44

 
272,081

 
$
8.44
Schedule of Restricted Stock Units Activity
RSU activity for the years ended December 31, 2017, 2016, and 2015 was as follows:
 
Number of Shares    
 
Weighted
Average
Grant Date Fair Value    
 
Fair Value
of Released
RSU’s (In thousands)    
Outstanding at January 1, 2015
564,891

 
 
 
 
Awarded
281,290

 
$
8.16

 
 
Released
(299,277
)
 
 
 
$
2,626

Forfeited
(59,481
)
 
 
 
 
Outstanding at December 31, 2015
487,423

 
 
 
 
Awarded
320,880

 
8.67

 
 
Released
(247,556
)
 
 
 
2,118

Forfeited
(133,555
)
 
 
 
 
Outstanding at December 31, 2016
427,192

 
 
 
 
Awarded
483,015

 
8.46

 
 
Released
(198,058
)
 
 
 
1,991

Forfeited
(203,269
)
 
 
 
 
Outstanding at December 31, 2017
508,880

 
 
 
 
Schedule of Information Regarding Restricted Stock Units Outstanding
Information regarding RSU’s at December 31, 2017, 2016, and 2015 is summarized below:
 
Number of Shares      
 
Weighted
Average
Remaining
Contractual Life (years)     
 
Aggregate
Intrinsic
Value (In millions)  
 
Fair Value (In millions)  
December 31, 2015
 
 
 
 
 
 
 
RSUs outstanding
487,423

 
0.90
 
$
5.7

 
$
5.7

RSUs vested and expected to vest using estimated forfeiture rates
414,934

 
0.87
 
4.8

 
 
December 31, 2016
 
 
 
 
 
 
 
RSUs outstanding
427,192

 
0.93
 
$
4.5

 
$
4.5

RSUs vested and expected to vest using estimated forfeiture rates
349,759

 
0.80
 
3.7

 
 
December 31, 2017
 
 
 
 
 
 
 
RSUs outstanding
508,880

 
1.30
 
3.6

 
$
3.6

RSUs vested and expected to vest using estimated forfeiture rates
414,847

 
1.16
 
2.9

 
 
Schedule of Restricted Stock Awards Activity
Restricted stock award activity for the years ended December 31, 2017, 2016, and 2015 was as follows:
 
Number of Shares    
 
Weighted
Average
Grant Date
Fair Value
 
Total
Fair
Value of
Awards
Released
(In thousands)
Outstanding at January 1, 2015
35,364

 
$
10.97

 
 
Awarded
21,356

 
12.26

 
 
Released
(35,364
)
 
10.97

 
$
434

Forfeited
—

 
 
 
 
Outstanding at December 31, 2015
21,356

 
12.26

 
 
Awarded
77,540

 
6.52

 
 
Released
(21,356
)
 
12.26

 
139

Forfeited
—

 
 
 
 
Outstanding at December 31, 2016
77,540

 
6.52

 
 
Awarded
44,538

 
8.65

 
 
Released
(77,540
)
 
6.52

 
671

Forfeited
—

 
 
 
 
Outstanding at December 31, 2017
44,538

 
8.65

 
 
Schedule of Stock Options, Market Condition Based Stock Options and Employee Stock Purchase Plan, Valuation Assumptions
The assumptions used to value option grants under the Company’s stock plans are as follows:
 
Standard Stock Options    
 
2017
 
2016
 
2015
Expected life (in years)
4.6

 
4.5

 
4.7

Interest rate
2.0
%
 
1.2
%
 
1.4
%
Volatility
52
%
 
56
%
 
56
%
Dividend yield
—
%
 
—
%
 
—
%
 
Market Condition Based Stock Options
 
2017
 
2016
 
2015
Expected life (in years)
7.0

 
7.0

 
7.0

Interest rate
2.0
%
 
1.6
%
 
1.9
%
Volatility
55
%
 
59
%
 
65
%
Dividend yield
—
%
 
—
%
 
—
%
 
Employee Stock Purchase Plan    
 
2017
 
2016
 
2015
Expected life (in years)
0.5

 
0.5

 
0.5

Interest rate
0.9
%
 
0.4
%
 
0.1
%
Volatility
48
%
 
53
%
 
48
%
Dividend yield
—
%
 
—
%
 
—
%
Schedule of Stock-Based Compensation
Total stock-based compensation recognized in the consolidated statements of income is as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Income Statement Classifications
(In thousands)
Sales and marketing
$
1,025

 
$
1,280

 
$
1,116

Research and development
981

 
1,297

 
1,303

General and administrative
4,096

 
3,534

 
3,051

Total
$
6,102

 
$
6,111

 
$
5,470