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Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [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
75,100

 
$
9.66

 
 
 
 
Exercised
(2,220,881
)
 
$
2.08

 
 
 
 
Unvested options forfeited
(239,322
)
 
$
6.66

 
 
 
 
Vested options expired
(69,495
)
 
$
2.61

 
 
 
 
Outstanding at December 31, 2015
14,019,629

 
$
3.62

 
6.5
 
$
80,740,577

Vested at December 31, 2015
10,951,694

 
$
2.80

 
6.2
 
$
71,955,234

Vested or expected to vest at December 31, 2015 (a)
13,917,122

 
$
3.60

 
6.5
 
$
80,496,150

(a)
Includes forfeiture adjusted unvested shares.
Summary of stock options outstanding and exercisable
Following is a summary of stock options outstanding and exercisable at December 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

 
3.4
 
$
0.72

 
441,429

 
$
0.72

$0.87 - $1.35
4,783,304

 
5.7
 
1.19

 
4,783,304

 
1.19

$1.40 - $2.45
1,641,928

 
5.1
 
1.93

 
1,641,928

 
1.93

$2.66 - $3.99
957,454

 
6.8
 
3.05

 
907,452

 
3.00

$4.19 - $6.38
3,552,323

 
7.4
 
5.35

 
2,229,386

 
5.32

$6.45- $9.78
2,527,525

 
8.1
 
7.29

 
914,703

 
7.18

  $9.90 - $10.99
115,666

 
8.9
 
10.43

 
33,492

 
10.50

 
14,019,629

 
6.5
 
$
3.62

 
10,951,694

 
$
2.80
Unvested stock options roll forward
A summary of the status of the Company’s unvested stock options as of December 31, 2015 is presented below:
Unvested Stock Options
Number of
Shares
 
Weighted-
Average
Grant Date Fair Value
Unvested at January 1, 2015
7,193,577

 
$
3.08

Granted
75,100

 
$
5.15

Cancelled
(239,322
)
 
$
3.79

Vested
(3,961,420
)
 
$
2.53

Unvested at December 31, 2015
3,067,935

 
$
3.81
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:
 
Year ended December 31,
 
2015
 
2014
 
2013
Expected volatility
54.35 - 58.14%

 
58.14 - 64.50%

 
61.41 - 64.77%

Expected life (in years)
6

 
6

 
6

Expected dividend yield
—

 
—

 
—

Risk-free interest rate
1.51 - 1.68%

 
1.64 - 1.96%

 
0.85 - 1.88%
Restricted stock awards roll forward
Following is summary information for restricted stock awards for the year ended December 31, 2015. Shares vest over a one to three year period. As of December 31, 2015, there was approximately $16,606,000 of total unrecognized stock-based compensation related to time-based, non-vested restricted stock.  That expense is expected to be recognized on a straight-line basis over a weighted-average period of 2.1 years.
Additionally, during the twelve months ended December 31, 2015, 5,172 shares of common stock valued at approximately $57,000 were issued under the 2006 Plan to a consultant in return for services performed.
 
 
Number of
Shares
 
Weighted-Average Grant Date
Fair Value
Unvested at January 1, 2015
 
1,228,898

 
$
7.16

Granted
 
1,974,259

 
$
9.80

Vested
 
(517,883
)
 
$
6.90

Forfeited
 
(72,007
)
 
$
9.77

Unvested at December 31, 2015
 
2,613,267

 
$
9.14
Allocation of share-based compensation
For the years ended December 31, 2015, 2014, and 2013 the Company recognized stock-based compensation as follows (in thousands):  
 
Year Ended December 31,
 
2015
 
2014
 
2013
Cost of sales
$
352

 
$
322

 
$
279

Research and development
790

 
660

 
417

Selling, general and administrative
15,754

 
10,471

 
5,314

 
$
16,896

 
$
11,453

 
$
6,010