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Stock-based compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Stock-based compensation  
Summary of stock option activity and related information

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    

 

    

 

 

    

Weighted-average

    

 

 

 

 

 

 

 

Weighted-average

 

remaining

 

Aggregate

 

 

 

 

 

exercise price per

 

contractual term

 

intrinsic value

 

 

    

Shares

    

share

    

(years)

    

(in thousands)

 

Outstanding at December 31, 2016

 

5,848,470

 

$

6.35

 

8.0

 

$

62

 

Granted

 

1,905,000

 

$

1.32

 

 

 

 

 

 

Exercised

 

 —

 

$

 —

 

 

 

 

 

 

Forfeited/cancelled

 

(180,315)

 

$

2.31

 

 

 

 

 

 

Outstanding at June 30, 2017

 

7,573,155

 

$

5.19

 

8.0

 

$

2,939

 

Vested at June 30, 2017

 

3,921,304

 

$

7.74

 

7.1

 

$

694

 

Vested and expected to vest at June 30, 2017(1)

 

7,323,155

 

$

5.32

 

8.0

 

$

2,737

 

(1)

This represents the number of vested options as of June 30, 2017, plus the number of unvested options expected to vest as of June 30, 2017.
Schedule of assumptions used to estimate fair value of each stock option on grant date

 

 

 

 

 

 

 

 

 

Six months ended June 30,

 

 

2017

 

2016

Risk-free interest rate

 

2.05

%  

 

1.47

%  

Volatility

 

79

%  

 

75

%  

Dividend yield

 

 —

 

 

 —

 

Expected term (years)

 
6.4

 

 
5.9