Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Tables)

v3.8.0.1
STOCK-BASED COMPENSATION (Tables)
12 Months Ended
Dec. 31, 2017
STOCK-BASED COMPENSATION  
Schedule of stock-based compensation expense related to all of the entity's share-based awards

Total stock‑based compensation expense related to all of our stock‑based awards was as follows (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31,

 

 

 

 

2017

    

2016

    

2015

 

General and administrative

 

 

$

4,490

 

$

4,230

 

$

3,303

 

Research and development

 

 

 

1,497

 

 

3,103

 

 

4,100

 

Restructuring charges

 

 

 

 —

 

 

499

 

 

 —

 

Total stock-based compensation expense

 

 

$

5,987

 

$

7,832

 

$

7,403

 

 

Summary of weighted-average assumptions relating to options granted pursuant to equity incentive plans

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended

 

 

 

 

December 31,

 

 

    

    

2017

    

2016

    

2015

 

Risk-free interest rate

 

 

2.2

%  

1.8

%  

1.8

%

Expected term (in years)

 

 

6.6

 

6.2

 

6.5

 

Dividend yield

 

 

0.0

%  

0.0

%  

0.0

%

Expected volatility

 

 

63.5

%  

61.1

%  

65.0

%

 

Schedule of option activity under equity incentive plans

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    

 

    

 

    

 

 

    

Weighted-

    

 

 

 

 

 

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

 

 

 

 

 

 

Remaining

 

 

 

 

 

 

Shares Available

 

Number of Shares

 

Weighted-Average

 

Contractual Term

 

Aggregate

 

 

 

For Grant

 

Underlying Options

 

Exercise Price

 

(in years)

 

Intrinsic Value

 

Outstanding at January 1, 2017

 

6,548,696

 

20,257,233

 

$

6.24

 

 

 

 

 

 

Authorized for grant

 

6,460,000

 

 

 

 

 

 

 

 

 

 

Granted

 

(4,048,675)

 

4,048,675

 

$

2.42

 

 

 

 

 

 

Exercised

 

 

(1,161,093)

 

$

2.30

 

 

 

 

 

 

Cancelled

 

2,736,675

 

(2,736,675)

 

$

8.18

 

 

 

 

 

 

Outstanding at December 31, 2017

 

11,696,696

 

20,408,140

 

$

5.45

 

5.23

 

$

13,736,285

 

Vested and expected to vest at December 31, 2017

 

 

 

20,408,140

 

$

5.45

 

 

 

 

 

 

Exercisable at December 31, 2017

 

 

 

15,742,515

 

$

6.25

 

4.16

 

$

8,298,096

 

 

Schedule of stock options by exercise price

Details of our stock options by exercise price are as follows as of December 31, 2017:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Options Outstanding

 

Options Exercisable

 

 

    

Number of

    

Weighted-Average

    

 

 

    

 

    

 

 

 

 

 

Outstanding

 

Remaining

 

Weighted-Average

 

Number of

 

Weighted-Average

 

Exercise Price

 

Options

 

Contractual Life (in years)

 

Exercise Price

 

Options

 

Exercise Price

 

$1.68 - $2.14

 

4,351,726

 

7.25

 

$

2.12

 

2,389,173

 

$

2.14

 

$2.27 - $2.74

 

3,682,677

 

7.83

 

 

2.60

 

2,439,679

 

 

2.68

 

$2.89 - $3.67

 

3,449,971

 

5.57

 

 

3.49

 

2,859,448

 

 

3.46

 

$3.79 - $6.51

 

3,831,410

 

4.63

 

 

5.62

 

2,961,860

 

 

6.13

 

$6.55 - $9.62

 

4,068,512

 

2.29

 

 

7.90

 

4,068,512

 

 

7.90

 

$9.80 - $26.45

 

1,023,844

 

0.13

 

 

26.02

 

1,023,844

 

 

26.02

 

$1.68 - $26.45

 

20,408,140

 

5.23

 

 

5.45

 

15,742,516

 

 

6.25

 

 

Summary of weighted-average assumptions used to calculate fair value of purchase rights granted under Employee Stock Purchase Plan

 

 

 

 

 

 

 

 

 

 

Year Ended

 

 

 

December 31,

 

 

    

2017

    

2016

    

2015

 

Risk-free interest rate

 

0.5

%  

0.5

%  

0.6

%

Expected term (in years)

 

1.5

 

1.5

 

1.5

 

Dividend yield

 

0.0

%  

0.0

%  

0.0

%

Expected volatility

 

63.1

%  

62.9

%  

61.2

%