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Employee and Consultant Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Activity
The following table summarizes option activity under all plans during the years ending December 31, 2017, and December 31, 2016 and shows the exercisable shares as of December 31, 2017:

Stock Option Activity
 
Number of Shares
Weighted Average Exercise Price per Share
Options Outstanding January 1, 2016
6,167,170

$
6.91

Granted
1,024,050

14.05

Forfeited
(147,663
)
18.43

Exercised
(158,743
)
7.47

Expired
(27,690
)
4.87

Options Outstanding December 31, 2016
6,857,124

7.72

Granted
1,208,542

23.84

Forfeited
(79,962
)
17.82

Exercised
(656,846
)
8.93

Expired
(727
)
24.45

Options Outstanding December 31, 2017
7,328,131

10.16

Exercisable December 31, 2017
5,163,899

6.38
Black-Scholes Assumptions for Option Granted
The table below summarizes the inputs used to calculate the estimated fair value of options awarded during the respective periods:

Black-Scholes Assumptions for Options Granted
 
Years ended December 31,
 
2017
2016
2015
Expected term (in years)
6.23

6.43

6.26

Volatility
77
%
86
%
91
%
Expected dividends
—

—

—

Risk free interest rates
2.1
%
1.6
%
1.7
%
Estimated forfeitures
—
%
8.5
%
5.6
%
Weighted average fair value
$
16.24

$
10.35

$
16.69
Stock Option Supplemental Information
The following table shows summary information for outstanding options and options that are exercisable (vested) as of December 31, 2017:

Stock Option Supplemental Information
 
Options
Outstanding
Options
Exercisable
Number of options
7,328,131

5,163,899

Weighted average remaining contractual term (in years)
6.16

5.19

Weighted average exercise price
$
10.16

$
6.38

Weighted average fair value
$
7.48

$
4.74

Aggregate intrinsic value (in millions)
$
117.7

$
102.4
Restricted Stock Activity
The following table summarizes RSU and SG activity during the years ending December 31, 2017, and December 31, 2016:

RSU and SG Activity
 
Number of Shares
Weighted Average Grant Date Fair Value per Share
RSU's & SG Outstanding January 1, 2016
40,250

20.91

Granted
—

—

Forfeited
—

—

Vested/released
—

—

RSU's & SG's outstanding December 31, 2016
40,250

20.91

Granted
1,911

22.40

Forfeited
—

—

Vested/released
(18,011
)
21.07

RSU's & SG's outstanding December 31, 2017
24,150

20.91
Weighted Average Fair Value of RSU's and SG's Awarded
The table below summarizes the weighted average fair value of RSU's and SG's awarded for the years ending December 31,:
RSU and SG Grants

2017
2016
2015
Weighted average fair value
22.40

—

20.91
Equity-Based Compensation Expense and Tax Benefit
The expense and tax benefits recognized on the Company’s consolidated statements of operations and comprehensive loss related to options for the years ending December 31, is summarized below (in thousands):

Equity-Based Compensation Expenses and Tax Benefit
(in thousands)
 
2017
2016
2015
Cost of Sales
$
99

$
—

$
—

Research and development
$
3,738

$
1,585

$
2,479

Sales, general and administrative
10,096

7,190

5,909

Total equity-based compensation expense
13,933

8,775

8,388

Recognized tax benefit
$
—

$
—

$
—