Annual report pursuant to Section 13 and 15(d)

Stock-Based Payments (Tables)

v3.8.0.1
Stock-Based Payments (Tables)
12 Months Ended
Dec. 31, 2017
Stock-Based Payments  
Summary of status of stock options and changes during the period

 

 

 

 

 

 

 

 

 

 

 

 

 

    

 

    

 

 

    

 

    

Aggregate

 

 

 

 

 

Weighted

 

Remaining

 

Intrinsic

 

 

 

 

 

Average

 

Contractual

 

Value

 

 

 

Shares

 

Exercise Price

 

Life (in years)

 

(in thousands)

 

Outstanding at December 31, 2016

 

2,543,435

 

$

6.44

 

8.3

 

$

14,898

 

Granted

 

1,368,000

 

 

11.87

 

 

 

 

 

 

Exercised

 

(445,012)

 

 

4.03

 

 

 

 

 

 

Cancelled

 

(619,755)

 

 

7.22

 

 

 

 

 

 

Outstanding at December 31, 2017

 

2,846,668

 

$

9.25

 

8.2

 

$

5,713

 

Exercisable at December 31, 2017

 

858,927

 

$

6.06

 

7.0

 

$

3,827

 

Vested and expected to vest at December 31, 2017

 

2,846,668

 

$

9.25

 

8.2

 

$

5,713

 

 

Summary of status of unvested restricted common stock and changes during the period

 

 

 

 

 

 

 

 

    

 

    

Weighted

 

 

 

 

 

Average Grant

 

 

 

Shares

 

Date Fair Value

 

Unvested at December 31, 2016

 

4,885

 

$

0.98

 

Vested

 

(4,885)

 

 

0.98

 

Repurchased

 

 —

 

 

 —

 

Unvested at December 31, 2017

 

 —

 

$

 —

 

 

Schedule of weighted-average assumptions used in Black-Scholes option-pricing model

 

 

 

 

 

 

 

 

 

 

Year Ended December 31,

 

 

    

2017

    

2016

    

2015

 

Weighted-average risk-free interest rate

 

2.07

%  

1.36

%  

1.78

%

Expected dividend yield

 

 —

%  

 —

%  

 —

%

Expected option term

 

6.05

 

5.98

 

6.09

 

Volatility

 

87.83

%  

85.39

%  

82.71

%

 

Summary of stock-based compensation expense for stock options and restricted common stock

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31, 

 

 

    

2017

    

2016

    

2015

 

Research and development

    

$

1,666

    

$

2,980

 

$

2,733

 

General and administrative

 

 

2,753

 

 

1,254

 

 

500

 

Total stock-based compensation expense

 

$

4,419

 

$

4,234

 

$

3,233