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Equity (Tables)
 3 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Stock Options Activity
Activity with respect to the stock options is summarized as follows:
 
Number
 of
Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2015
16,474,227

 
$
3.43

 
 
 
 
Granted
57,600

 
9.55

 
 
 
 
Exercised
(760,156
)
 
1.68

 
 
 
 
Unvested options forfeited
(140,996
)
 
6.43

 
 
 
 
Outstanding at March 31, 2015
15,630,675

 
3.51

 
7.1
 
$
107,655,519

Vested at March 31, 2015
10,940,415

 
2.51

 
6.6
 
$
86,267,905

Vested or expected to vest at March 31, 2015 (a)
15,419,100

 
$
3.47

 
7.1
 
$
106,858,970

(a)
Includes forfeiture adjusted unvested shares.
Stock Options Outstanding and Exercisable
Following is a summary of stock options outstanding and exercisable at March 31, 2015:
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
Number outstanding
 
Weighted-Average
Remaining
Contractual Term
(in years)
 
Weighted-
Average
Exercise
Price
 
Number Exercisable
 
Weighted-
Average
Exercise Price
$0.50 - $0.76
441,429

 
4.1
 
$
0.72

 
441,429

 
$
0.72

$0.87 - $1.35
5,544,494

 
6.4
 
1.20

 
5,519,492

 
1.20

$1.40 - $2.29
1,361,717

 
4.7
 
1.64

 
1,240,048

 
1.65

$2.33 - $3.75
1,668,922

 
7.4
 
2.77

 
1,015,730

 
2.78

$3.95 - $5.99
3,246,711

 
8.1
 
5.18

 
1,790,263

 
5.1

$6.02 - $9.13
3,184,802

 
8.5
 
7.06

 
933,453

 
7.07

$9.22- $10.99
182,600

 
9.7
 
10.13

 
—

 
—

 
15,630,675

 
7.1
 
$
3.51

 
10,940,415

 
$
2.51
Fair Value of Options, Valuation Assumptions
The assumptions used in calculating the fair value of options using the Black-Scholes-Merton option-pricing model are set forth in the following table:
 
Three Months Ended March 31,
 
2015
 
2014
Expected volatility
56.8- 58.1%

 
64.1 - 64.5%

Expected life (in years)
6.0

 
6.0

Expected dividend yield
—

 
—

Risk-free interest rate
1.57% - 1.66%

 
1.69% - 1.96%
Restricted Stock Awards Roll Forward
Activity with respect to restricted stock awards is summarized as follows: 
 
Number
of
Shares
 
Weighted-Average Grant Date
Fair Value
Unvested at January 1, 2015
1,228,898

 
$7.16
Granted
1,290,858

 
9.52
Vested
(232,691
)
 
6.54
Forfeited
(715
)
 
7.24

Unvested at March 31, 2015
2,286,350

 
$8.56
Allocation of Share-based Compensation
For the three months ended March 31, 2015 and 2014, the Company recognized stock-based compensation as follows (in thousands): 
 
Three Months Ended March 31,
 
2015
 
2014
Cost of sales
$
95

 
$
97

Research and development
186

 
160

Selling, general and administrative
3,652

 
2,115

 
$
3,933

 
$
2,372