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Equity (Tables)
 3 Months Ended
Mar. 31, 2016
Equity [Abstract]  
Activity with respect to the stock options
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, 2016
14,019,629

 
$
3.62

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Exercised
(608,717
)
 
$
1.87

 
 
 
 
Unvested options forfeited
(120,563
)
 
$
6.05

 
 
 
 
Vested options expired
(12,497
)
 
$
6.34

 
 
 
 

Outstanding at March 31, 2016
13,277,852

 
$
3.69

 
6.3
 
$
67,341,642

Vested at March 31, 2016
11,714,483

 
$
3.24

 
6.1
 
$
64,456,036

Vested or expected to vest at March 31, 2016 (a)
13,210,155

 
$
3.67

 
6.3
 
$
67,231,821
Following is a summary of stock options outstanding and exercisable
Following is a summary of stock options outstanding and exercisable at March 31, 2016:
 
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

 
3.2
 
$
0.72

 
441,429

 
$
0.72

$0.87 - $1.35
4,431,970

 
5.4
 
1.19

 
4,431,970

 
1.19

$1.40 - $2.45
1,460,924

 
4.7
 
1.92

 
1,460,924

 
1.92

$2.66 - $3.99
894,120

 
6.6
 
3.06

 
894,120

 
3.06

$4.19 - $6.38
3,426,178

 
7.2
 
5.35

 
2,897,570

 
5.26

$6.45 - $9.78
2,512,065

 
7.9
 
7.29

 
1,556,144

 
7.24

$9.90- $10.99
111,166

 
8.6
 
10.44

 
32,326

 
10.51

 
13,277,852

 
6.3
 
$
3.69

 
11,714,483

 
$
3.24
Assumptions used in calculating the fair value of options using the Black-Scholes-Merton option-pricing model
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,
 
2016
 
2015
Expected volatility
n/a
 
56.8 - 58.1%

Expected life (in years)
n/a
 
6.0

Expected dividend yield
n/a
 
—

Risk-free interest rate
n/a
 
1.57% - 1.66%
Activity with respect to restricted stock awards
Activity with respect to restricted stock awards is summarized as follows: 
 
Number
of
Shares
 
Weighted-Average Grant Date
Fair Value
Unvested at January 1, 2016
2,613,267

 
$9.14
Granted
1,576,579

 
8.18
Vested
(644,903
)
 
8.42
Forfeited
(45,263
)
 
8.87

Unvested at March 31, 2016
3,499,680

 
$8.84
Allocation of share-based compensation
For the three months ended March 31, 2016 and 2015, the Company recognized stock-based compensation as follows (in thousands): 
 
Three Months Ended March 31,
 
2016
 
2015
Cost of sales
$
96

 
$
95

Research and development
205

 
186

Selling, general and administrative
4,314

 
3,652

 
$
4,615

 
$
3,933