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Stock Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Stock Incentive Plans.  
Summary of the Company's stock option activity

 

 

 

 

Shares

 

Weighted-
Average
Exercise Price

 

Weighted
Average
Remaining
Contractual
Term (years)

 

Aggregate
Intrinsic Value
(in thousands)

 

Outstanding at December 31, 2015

 
1,723,554

 

$
6.66

 
7.92

 

$
4,267

 

Granted

 
541,395

 
4.58

 

 

 

 

 

Exercised

 
(36,880

)
1.86

 

 

 

 

 

Cancelled or forfeited

 
(140,627

)
6.00

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at June 30, 2016

 
2,087,442

 

$
6.25

 
7.94

 

$
986

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercisable at June 30, 2016

 
962,927

 

$
4.46

 
6.67

 

$
942

 

 

 

 

 

 

 

 

 

 

 

 

 

Vested or expected to vest at June 30, 2016

 
2,013,028

 

$
6.20

 
7.89

 

$
985