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Stockholders' equity (Tables)
 9 Months Ended
Sep. 30, 2016
Equity incentive plans  
Summary of stock option activity

 

The following table summarizes stock option activity for the nine months ended September 30, 2016 (shares and intrinsic value in thousands):

 

 

 

Number of shares

 

Weighted-average
exercise price

 

Weighted-average
remaining contractual
term

 

Aggregate intrinsic
value

 

Outstanding at December 31, 2015

 
2,043

 

$
11.49

 
7.6

 

$
6,740

 

Granted

 
30

 
13.64

 

—

 

—

 

Exercised

 
(13

)
10.60

 

—

 

—

 

Forfeited

 

—

 

—

 

—

 

—

 

Expired

 

—

 

—

 

—

 

—

 

 

 

 

 

 

 

 

 

 

 

Outstanding at September 30, 2016

 
2,060

 

$
11.53

 
6.9

 

$
3,466

 

 

 

 

 

 

 

 

 

 

 

 

 

Vested at September 30, 2016

 
1,487

 

$
11.52

 
6.7

 

$
2,597

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercisable at September 30, 2016

 
1,487

 

$
11.52

 
6.7

 

$
2,597

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Summary of restricted share activity

 

The following table summarizes restricted share activity for the nine months ended September 30, 2016 (shares in thousands):

 

 

 

Number of shares

 

Weighted-average
grant date fair value

 

Outstanding at December 31, 2015

 
494

 

$
9.79

 

Granted

 
79

 
11.41

 

Vested

 
(308

)
10.78

 

Forfeited

 

—

 

—

 

 

 

 

 

 

 

Outstanding at September 30, 2016

 
265

 

$
9.13

 

 

 

 

 

 

 

 

 

Time Based Stock Option | Black Scholes Pricing Model  
Equity incentive plans  
Schedule of valuation assumptions

 

Black-Scholes Option Valuation Assumptions

 

Nine Months Ended
September 30, 2016

 

Year Ended
December 31, 2015

 

Risk-free interest rate

 
1.60 

%

1.76%-2.12%

 

Dividend yield

 

—

 

—

 

Volatility

 
26.37 

%

25.8%-29.5%

 

Weighted-average expected term (years)

 
6.0 

 
6.3