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Stock-based Compensation Expense (Tables)
9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based compensation expense by line item
During the three and nine months ended September 30, 2017 and 2016, the Company recognized the following stock-based compensation expense:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Stock-based compensation expense by type of award:
 
 
 
 
 
 
 
Stock options
$
25,969

 
$
28,773

 
$
80,865

 
$
86,859

Restricted stock and restricted stock units
46,737

 
30,966

 
131,388

 
88,107

ESPP share issuances
2,428

 
2,425

 
6,738

 
6,385

Less stock-based compensation expense capitalized to inventories
(1,364
)
 
(955
)
 
(3,657
)
 
(2,728
)
Total stock-based compensation included in costs and expenses
$
73,770

 
$
61,209

 
$
215,334

 
$
178,623

 
 
 
 
 
 
 


Stock-based compensation expense by line item:
 
 
 
 
 
 
 
Research and development expenses
$
46,186

 
$
39,980

 
$
134,855

 
$
115,068

Sales, general and administrative expenses
27,584

 
21,229

 
80,479

 
63,555

Total stock-based compensation included in costs and expenses
$
73,770

 
$
61,209

 
$
215,334

 
$
178,623

Unrecognized stock-based compensation expense, net of estimated forfeitures
The following table sets forth the Company’s unrecognized stock-based compensation expense by type of award and the weighted-average period over which that expense is expected to be recognized:
 
As of September 30, 2017
 
Unrecognized Expense
 
Weighted-average
Recognition Period
 
(in thousands)
 
(in years)
Type of award:
 
 
 
Stock options
$
175,298

 
2.60
Restricted stock and restricted stock units
$
289,008

 
2.64
ESPP share issuances
$
2,636

 
0.46
Stock options outstanding and exercisable
The following table summarizes information about stock options outstanding and exercisable at September 30, 2017:
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Number
Outstanding
 
Weighted-average
Remaining
Contractual Life
 
Weighted-average
Exercise Price
 
Number
Exercisable
 
Weighted-average
Exercise Price
 
 
(in thousands)
 
(in years)
 
(per share)
 
(in thousands)
 
(per share)
$18.93–$20.00
 
128

 
0.35
 
$
18.93

 
128

 
$
18.93

$20.01–$40.00
 
834

 
2.21
 
$
34.51

 
834

 
$
34.51

$40.01–$60.00
 
877

 
4.83
 
$
49.17

 
877

 
$
49.17

$60.01–$80.00
 
821

 
6.46
 
$
75.62

 
649

 
$
75.44

$80.01–$100.00
 
4,587

 
8.33
 
$
89.37

 
1,397

 
$
89.47

$100.01–$120.00
 
1,137

 
7.36
 
$
109.34

 
586

 
$
109.24

$120.01–$140.00
 
1,260

 
7.88
 
$
130.24

 
688

 
$
129.86

$140.01–$160.00
 

 
0.00
 
$

 

 
$

$160.01–$163.74
 
634

 
9.80
 
$
162.94

 
3

 
$
162.94

Total
 
10,278

 
7.22
 
$
91.28

 
5,162

 
$
77.92