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Stock Option and Other Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Stock Option and Other Benefit Plans  
Calculation of Share-based Awards Available for Grant

 

 

 

 

 

    

    

 

 

 

Shares

 

 

   

Available

   

Balances at December 31, 2015

 
9,684

 

Increase in authorized shares

 
6,000

 

Share-based awards granted (1)

 
(16,720)

 

Share-based awards canceled (2)

 
4,900

 

Balances at December 31, 2016

 
3,864

 

 

(1)

Under the terms of the Amended 2007 Plan, RSUs granted on or after June 6, 2013 but before June 4, 2015 reduced the number of shares available for grant by 1.39 shares for each share subject to an RSU award. Under the terms of the Second Amended 2007 Plan, RSUs granted on or after June 4, 2015 reduce the number of shares available for grant by 1.32 shares for each share subject to an RSU award.

 

(2)

Under the terms of the Amended 2007 Plan, RSUs forfeited and returned to the pool of shares available for grant that were granted on or after June 6, 2013 but before June 4, 2015 increase the pool by 1.39 shares for each share subject to an RSU that is forfeited. RSUs forfeited and returned to the pool of shares available for grant that were granted on or after June 4, 2015 increase the pool by 1.32 shares for each share subject to an RSU that is forfeited.
Summary of Company's RSU Activity

 

 

 

 

 

 

 

 

 

 

 

 

 

    

    

    

Weighted

    

 

 

 

 

Number of

 

Average

 

Aggregate

 

 

 

Units

 

Grant Date

 

Intrinsic

 

 

   

Outstanding

   

Fair Value

   

Value

 

Awarded and unvested, December 31, 2015

 
7,344

 

$
4.40

 

 

 

 

Granted

 
5,094

 

$
2.52

 

 

 

 

Vested

 
(2,422)

 

$
4.51

 

 

 

 

Forfeited

 
(1,792)

 

$
3.86

 

 

 

 

Awarded and unvested, December 31, 2016

 
8,224

 

$
3.33

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Restricted stock units vested and expected to vest at December 31, 2016

 
7,013

 

$
3.36

 

$
13,605

 

 

Stock Option Activity

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Options Outstanding

 

 

 

 

 

 

 

    

Weighted

    

Weighted

    

    

    

 

 

 

 

 

Number

 

Average

 

Average

 

Aggregate

 

 

 

of

 

Exercise

 

Contractual

 

Intrinsic

 

 

 

Shares

 

Price

 

Term (Years)

 

Value

 

Balances at December 31, 2013

    
10,399

    

 
2.98

    

    

    

 

    

 

Options granted

 
1,344

 

 
4.08

 

 

 

 

 

 

Options canceled

 
(1,506)

 

 
3.72

 

 

 

 

 

 

Options exercised

 
(2,867)

 

 
2.19

 

 

 

 

 

 

Balances at December 31, 2014

    
7,370

    

 
3.32

    

    

    

 

    

 

Options granted

 
1,659

 

 
4.65

 

 

 

 

 

 

Options canceled

 
(425)

 

 
4.00

 

 

 

 

 

 

Options exercised

 
(1,440)

 

 
2.64

 

 

 

 

 

 

Balances at December 31, 2015

    
7,164

    

$
3.73

    
4.05

    

$
389

 

Options granted

 
10,347

 

$
2.16

 

 

 

 

 

 

Options canceled

 
(1,273)

 

$
4.04

 

 

 

 

 

 

Options exercised

 
(425)

 

$
1.55

 

 

 

 

 

 

Balances at December 31, 2016

 
15,813

 

$
2.74

 
7.38

 

$

 —

 

 

 

 

 

 

 

 

 

 

 

 

 

Options vested and expected to vest at December 31, 2016

 
13,868

 

$
2.81

 
7.06

 

$

 —

 

Options exercisable at December 31, 2016

 
4,889

 

$
3.72

 
2.77

 

$

 —

 

 

Options Outstanding and Currently Exercisable by Exercise Price

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Options Outstanding

 

Options Exercisable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted

 

 

 

 

 

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

 

 

 

 

 

Remaining

 

Weighted

 

 

 

Weighted

Range of

 

 

 

Contractual

 

Average

 

 

 

Average

Exercise

 

Number

 

Life

 

Exercise

 

Number

 

Exercise

Prices

   

Outstanding

   

(in Years)

   

Price

   

Exercisable

   

Price

$  2.10 - $ 2.10

 
5,707

 
9.87

 

$
$
2.10

 

-

 

$
$
0.00

$  2.13 - $ 2.13

 
3,450

 
9.78

 

 
$
2.13

 

-

 

 
$
0.00

$  2.14 - $ 2.90

 
1,951

 
3.27

 

 
$
2.63

 
1,474

 

 
$
2.74

$  2.91 - $ 3.29

 
2,089

 
4.21

 

 
$
3.09

 
1,452

 

 
$
3.14

$  3.56 - $ 4.30

 
1,582

 
4.66

 

 
$
4.00

 
1,002

 

 
$
3.95

$  4.35 - $ 6.67

 
966

 
4.18

 

 
$
5.40

 
893

 

 
$
5.43

$  9.64 - $9.64

 
1

 
0.77

 

 
$
9.64

 
1

 

 
$
9.64

$  11.50 - $ 11.50

 
65

 
0.22

 

 
$
11.50

 
65

 

 
$
11.50

$  11.66 - $ 11.66

 
1

 
0.57

 

 
$
11.66

 
1

 

 
$
11.66

$  11.88- $ 11.88

 
1

 
0.30

 

 
$
11.88

 
1

 

 
$
11.88

$  2.10 - $ 11.88

 
15,813

 
7.38

 

$
$
2.74

 
4,889

 

$
3.72

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Schedule of Assumptions Used in Black-Scholes Valuation Model and Weighted Average Assumptions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31, 

 

 

 

2016

   

2015

   

2014

 

Dividend yield

 

 —

%

 —

%

 —

%

Risk-free interest rate

 
1.39

%
1.34

%
1.34

%

Expected volatility

 
52.3

%
51.8

%
52.0

%

Expected term (years)

 
4.00

 
4.00

 
4.00

 

 

Stock-Based Compensation Expense

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31, 

 

 

 

2016

   

2015

   

2014

 

Research and development

 

$
4,567

 

$
3,563

 

$
7,422

 

Sales and marketing

 

 
1,091

 

 
1,082

 

 
701

 

General and administrative

 

 
7,605

 

 
7,041

 

 
3,510

 

Total stock-based compensation expense

 

$
13,263

 

$
11,686

 

$
11,633