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Stock Option Plans (Tables)
3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation Allocation
Stock-based compensation costs included in the consolidated statements of income are presented below:
 
Three Months Ended 
 March 31,
 
2015
 
2014
Cost of products
$
34

 
$

Cost of services
98

 

Research and development
1,769

 
348

Selling, general and administrative
8,358

 
3,426

Total
$
10,259

 
$
3,774

Schedule of Stock Option Activity
Stock option activity under Intrexon's award plans was as follows:
 
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (Years)
Balances at December 31, 2014
8,323,544

 
$
22.59

 
8.64
Granted
950,500

 
43.17

 
 
Exercised
(204,487
)
 
(12.56
)
 
 
Forfeited
(118,036
)
 
(24.76
)
 
 
Expired
(142
)
 
(7.12
)
 
 
Balances at March 31, 2015
8,951,379

 
24.97

 
8.49
Exercisable at March 31, 2015
2,568,344

 
18.74

 
7.32
Vested and Expected to Vest at March 31, 2015(1)
7,447,767

 
24.20

 
8.38
(1)
The number of stock options expected to vest takes into account an estimate of expected forfeitures.