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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Options and Awards
 
December 31, 2018
Common stock shares available for grant
1,791,088

Standard and market condition based stock options outstanding
2,134,504

Restricted stock awards outstanding
54,667

Restricted stock units outstanding
1,090,752
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, 2018
Shares purchased under ESPP
26,689

Average price of shares purchased under ESPP
$
8.17

Intrinsic value of shares purchased under ESPP
$
106,000
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, 2018, 2017 and 2016. There were no activities for the year ended December 31, 2018.
 
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, 2016
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

 
 
 
 
Granted
—

 


 


 
 
Exercised
—

 


 
 
 

Forfeited
—

 


 
 
 
 
Expired
—

 


 
 
 
 
Outstanding at December 31, 2018
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, 2018, 2017, and 2016:
 
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, 2016
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

 
 
 
 
Granted
207,500

 
$
12.50

 
$
5.82

 
 
Exercised
(1,452,306
)
 
$
6.52

 
 
 
$
8,222

Forfeited
(78,390
)
 
$
8.31

 
 
 
 
Expired
(92,372
)
 
$
11.93

 
 
 
 
Outstanding at December 31, 2018
1,862,423

 
$
9.44

 
 
 
 
Schedule of Information Regarding Standard and Market Condition Based Stock Options Outstanding
Information regarding standard stock options outstanding at December 31, 2018, 2017, and 2016 is summarized below:
 
Number of
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life (years)
 
Aggregate
Intrinsic
Value
(in millions)
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

December 31, 2018
 
 
 
 
 
 
 
Options outstanding
1,862,423

 
$
9.44

 
2.85
 
$
0.8

Options vested and expected to vest using estimated forfeiture rates
1,785,740

 
$
9.40

 
2.74
 
$
0.7

Options exercisable
1,396,171

 
$
9.22

 
1.97
 
$
0.5

Information regarding these market condition based stock options outstanding at December 31, 2018, 2017 and 2016 is summarized below:
 
Number
of Shares    
 
Weighted
Average
Exercise
Price    
 
Weighted
Average
Remaining
Contractual Life (years)     
 
Aggregate
Intrinsic
Value
(in millions)  
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
 
$
—

December 31, 2018
 
 
 
 
 
 
 
Options outstanding
272,081

 
$
8.44

 
0.91
 
$
0.1

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

 
$
8.44

 
0.91
 
$
0.1

Options exercisable
272,081

 
$
8.44

 
0.91
 
$
0.1
Additional Information Regarding Options Outstanding
Additional information regarding market condition based stock options outstanding as of December 31, 2018 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

 
0.91
 
$
8.09

 
135,000

 
$
8.09

  8.65 - 8.65
84,581

 
0.91
 
$
8.65

 
84,581

 
$
8.65

  9.00 - 9.00
52,500

 
0.91
 
$
9.00

 
52,500

 
$
9.00

$8.09 - $9.00
272,081

 
0.91
 
$
8.44

 
272,081

 
$
8.44

Additional information regarding standard options outstanding as of December 31, 2018 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
$5.53 - $7.79
 
321,144

 
4.16
 
$
7.21

 
189,149

 
$
7.06

8.09 - 8.45
 
222,175

 
4.38
 
8.29

 
143,083

 
8.22

8.64 - 9.00
 
259,173

 
2.45
 
8.83

 
226,776

 
8.82

9.53 - 9.53
 
671,500

 
0.95
 
9.53

 
671,500

 
9.53

9.68 - 11.84
 
205,573

 
5.68
 
11.66

 
25,693

 
10.87

11.94 - 12.20
 
100,963

 
1.51
 
11.94

 
100,963

 
11.94

12.26 - 12.26
 
21,675

 
3.43
 
12.26

 
21,675

 
12.26

12.38 - 12.38
 
4,320

 
3.87
 
12.38

 
3,420

 
12.38

12.48 - 12.48
 
15,900

 
3.54
 
12.48

 
13,912

 
12.48

15.25 - 15.25
 
40,000

 
6.54
 
15.25

 
—

 
—

$5.53 - $15.25
 
1,862,423

 
2.85
 
$
9.44

 
1,396,171

 
$
9.22
Schedule of Restricted Stock Units Activity
RSU activity for the years ended December 31, 2018, 2017, and 2016 was as follows:
 
Number of Shares    
 
Weighted Average
Grant Date Fair Value    
 
Fair Value
of Released RSU’s (in thousands)    
Outstanding at January 1, 2016
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

 
 
 
 
Awarded
957,443

 
$
11.74

 
 
Released
(178,447
)
 
 
 
$
2,133

Forfeited
(197,124
)
 
 
 
 
Outstanding at December 31, 2018
1,090,752

 
 
 
 
Schedule of Information Regarding Restricted Stock Units Outstanding
Information regarding RSU’s at December 31, 2018, 2017, and 2016 is summarized below:
 
Number of Shares      
 
Weighted
Average
Remaining
Contractual Life (years)     
 
Aggregate
Intrinsic
Value
(in millions)  
 
Fair Value
(in millions)  
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

 
 
December 31, 2018
 
 
 
 
 
 
 
RSUs outstanding
1,090,752

 
0.67
 
$
9.8

 
$
9.8

RSUs vested and expected to vest using estimated forfeiture rates
959,209

 
0.56
 
$
8.6

 
 
Schedule of Restricted Stock Awards Activity
Restricted stock award activity for the years ended December 31, 2018, 2017, and 2016 was as follows:
 
Number of Shares    
 
Weighted Average Grant Date
Fair Value
 
Total Fair Value of Awards Released
(in thousands)
Outstanding at January 1, 2016
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

 
 
Awarded
62,556

 
$
13.32

 
 
Released
(44,538
)
 
$
8.65

 
$
673

Forfeited
(7,889
)
 
$
15.44

 
 
Outstanding at December 31, 2018
54,667

 
$
13.02

 
 
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    
 
2018
 
2017
 
2016
Expected life (in years)
4.4

 
4.6

 
4.5

Interest rate
3.0
%
 
2.0
%
 
1.2
%
Volatility
55
%
 
52
%
 
56
%
Dividend yield
—
%
 
—
%
 
—
%
 
Market Condition Based Stock Options
 
2018 (1)
 
2017
 
2016
Expected life (in years)
N/A
 
7.0

 
7.0

Interest rate
N/A
 
2.0
%
 
1.6
%
Volatility
N/A
 
55
%
 
59
%
Dividend yield
N/A
 
—
%
 
—
%
(1) No market condition based stock options were granted during the year ended December 31, 2018.
 
Employee Stock Purchase Plan    
 
2018
 
2017
 
2016
Expected life (in years)
0.5

 
0.5

 
0.5

Interest rate
1.9
%
 
0.9
%
 
0.4
%
Volatility
58
%
 
48
%
 
53
%
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,
 
2018
 
2017
 
2016
Income Statement Classifications
(in thousands)
Sales and marketing
$
946

 
$
1,025

 
$
1,280

Research and development
1,948

 
981

 
1,297

General and administrative
5,792

 
4,096

 
3,534

Total
$
8,686

 
$
6,102

 
$
6,111