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STOCK-BASED COMPENSATION (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of total shares available for grant
The following table summarizes the total number of shares available for grant under the 2014 Plan as of December 31, 2015:
 
 
 
Shares Available for Grant
 
 
Balance, December 31, 2014
2,259,230

Authorized
5,306,812

Options granted
(1,759,063
)
Options canceled
1,375,261

Awards granted
(3,318,015
)
Awards canceled
1,153,300

Balance, December 31, 2015
5,017,525

Summary of shares available for grant and outstanding stock option activity
The following table summarizes the information about outstanding stock option activity:
 
Options Outstanding
 
Number of
Shares
Underlying
Outstanding
Options
 
Weighted
Average
Exercise 
Price
 
Weighted
Average
Remaining
Contractual Term
(Years)
 
Aggregate
Intrinsic
Value
 
 
 
 
 
 
 
(in thousands)
Balance, December 31, 2014
6,837,893

 
$
5.71

 
7.39
 
$
8,004

Options granted
1,759,063

 
6.87

 
 
 
 
Options exercised
(678,533
)
 
2.25

 
 
 
 
Options canceled
(1,375,261
)
 
7.25

 
 
 
 
Balance, December 31, 2015
6,543,162

 
$
6.05

 
7.03
 
$
6,570

Options exercisable, December 31, 2015
3,252,497

 
$
4.33

 
5.74
 
$
6,160

Options vested and expected to vest, December 31, 2015
6,145,853

 
$
5.95

 
6.93
 
$
6,548

Stock options outstanding and exercisable under stock option plans
The stock options outstanding and exercisable under its stock option plan as of December 31, 2015, are as follows:
 
 
Options Outstanding
 
Options Vested and Exercisable
Range of Exercise Prices
 
Number of
Options Outstanding
 
Weighted
Average
Remaining
Contractual Term
(Years)
 
Weighted
Average
Exercise Price per Share
 
Number of
Options Exercisable
 
Weighted
Average
Exercise Price per Share
 
 
 
 
 
 
 
 
 
 
 
$0.08 - $1.83
 
1,080,321

 
4.52
 
$
1.00

 
1,077,605

 
$
1.00

$2.05 - $5.61
 
918,658

 
7.19
 
2.90

 
584,886

 
2.15

$6.00
 
1,182,285

 
5.66
 
6.00

 
907,365

 
6.00

$6.09 - $6.85
 
245,000

 
9.60
 
6.28

 

 

$7.15
 
1,175,624

 
9.03
 
7.15

 
156,240

 
7.15

$7.48 - $11.31
 
1,941,274

 
7.64
 
9.68

 
526,401

 
9.87

 
 
6,543,162

 
7.03
 
$
6.05

 
3,252,497

 
$
4.33

Summary of RSU activity and related information
summary of the Company’s RSU activity and related information for the year ended December 31, 2015:
 
Restricted Stock Units Outstanding
 
Shares
 
Weighted Average
Grant Date
Fair Value Per Share
 
 
 
 
Balance, December 31, 2014
2,938,231

 
$
7.03

Awards granted
3,318,015

 
6.45

Awards vested
(1,580,206
)
 
$
7.15

Awards canceled
(629,934
)
 
$
7.13

Balance, December 31, 2015
4,046,106

 
$
6.49

Summary of the assumptions related to stock options
Weighted average assumptions for the Company's stock options granted were as follows:
 
Year Ended December 31,
 
2015
 
2014
 
2013
Stock options:
 
 
 
 
 
Expected term (in years)
6.04

 
5.56

 
5.99

Expected volatility
51
%
 
49
%
 
54
%
Risk free interest rate
1.75
%
 
1.85
%
 
1.48
%
Dividend rate

 

 

Weighted average assumptions used to value employee stock purchase rights
Weighted average assumptions used to value employee stock purchase rights under the Black-Scholes model were as follows:
 
Year Ended December 31,
 
2015
 
2014
ESPP purchase rights:
 
 
 
Expected term (in years)
0.5 - 2.00
 
0.68 - 2.00
Expected volatility
35% - 55%
 
35% - 40%
Risk free interest rate
0.07% - 0.51%
 
0.08% - 0.49%
Dividend rate
 
Schedule of stock-based awards granted in the consolidated statements of operations
The total stock-based compensation the Company recognized for stock-based awards in the consolidated statements of operations is as follows:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(in thousands)
Cost of revenue
$
902

 
$
411

 
$
64

Research and development
4,651

 
2,419

 
929

Sales and marketing
7,112

 
4,121

 
1,573

General and administrative
5,706

 
3,301

 
1,721

Total stock-based compensation
$
18,371

 
$
10,252

 
$
4,287


The following table presents stock-based compensation expense by award-type:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(in thousands)
Stock Options
$
4,733

 
$
5,780

 
$
4,287

Restricted Stock Units
11,652

 
3,188

 

Employee Stock Purchase Plan
1,986

 
1,284

 

Total stock-based compensation
$
18,371

 
$
10,252

 
$
4,287