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Equity (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016
14,019,629

 
$
3.62

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Exercised
(926,010
)
 
$
2.76

 
 
 
 
Unvested options forfeited
(93,097
)
 
$
6.52

 
 
 
 
Vested options expired
(38,354
)
 
$
6.77

 
 
 
 

Outstanding at September 30, 2016
12,962,168

 
$
3.65

 
5.77
 
$
64,153,271

Vested at September 30, 2016
11,818,559

 
$
3.30

 
5.62
 
$
62,449,678

Vested or expected to vest at September 30, 2016 (a)
12,937,248

 
$
3.30

 
5.62
 
$
64,120,370

(a)
Includes forfeiture adjusted unvested shares.
Stock Options Outstanding and Exercisable
Following is a summary of stock options outstanding and exercisable at September 30, 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

 
2.6
 
$
0.72

 
441,429

 
$
0.72

$0.87 - $1.35
4,397,970

 
4.9
 
1.19

 
4,397,970

 
1.19

$1.40 - $2.45
1,442,424

 
4.2
 
1.92

 
1,442,424

 
1.92

$2.66 - $3.99
889,430

 
6.1
 
3.06

 
889,430

 
3.06

$4.19 - $6.38
3,253,783

 
6.7
 
5.36

 
2,997,303

 
5.32

$6.45 - $9.78
2,431,132

 
7.4
 
7.30

 
1,614,677

 
7.23

$9.90- $10.99
106,000

 
8.2
 
10.43

 
35,326

 
10.43

 
12,962,168

 
5.8
 
$
3.65

 
11,818,559

 
$
3.30
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:
 
Nine Months Ended September 30,
 
2016
 
2015
Expected volatility
n/a
 
54.4 - 58.1 %

Expected life (in years)
n/a
 
6.0

Expected dividend yield
n/a
 
—

Risk-free interest rate
n/a
 
1.51 - 1.68%
Restricted Stock Awards Roll Forward
Activity with respect to restricted stock awards for the nine months ended September 30, 2016 is summarized as follows: 
 
Number
of
Shares
 
Weighted-Average Grant Date
Fair Value
Unvested at January 1, 2016
2,613,267

 
$9.14
Granted
2,369,876

 
7.98
Vested
(952,910
)
 
8.75
Forfeited
(137,575
)
 
8.73

Unvested at September 30, 2016
3,892,658

 
$8.54
Allocation of Share-based Compensation
For the three and nine months ended September 30, 2016 and 2015, the Company recognized stock-based compensation as follows (in thousands): 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Cost of sales
$
109

 
$
85

 
$
300

 
$
270

Research and development
159

 
202

 
520

 
591

Selling, general and administrative
4,433

 
4,091

 
13,006

 
11,703

 
$
4,701

 
$
4,378

 
$
13,826

 
$
12,564