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Employee Equity-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Activity
The following table summarizes option activity under all plans during the six-month period ended June 30, 2018:

 
Number of Shares
Weighted Average Exercise Price per Share
Options Outstanding January 1, 2018
7,328,131

$
10.16

Granted
1,115,371

25.45

Forfeited
(91,043
)
20.97

Exercised
(253,621
)
10.87

Expired
(5,495
)
23.43

Options Outstanding June 30, 2018
8,093,343

12.11
Inputs to Calculate Estimated Fair Value of Options Awarded
The table below summarizes the resulting weighted average inputs used to calculate the estimated fair value of options awarded during the periods shown below:

 
Three Months Ended
 
June 30,
June 30,
 
2018
2017
Expected term (in years)
6.06

6.12

Volatility
64
%
75
%
Expected dividends
—

—

Risk free interest rates
2.82
%
2.02
%
Weighted average fair value
$
13.53

$
16.80
Stock Option Supplemental Information
The following table shows summary information for outstanding options and options that are exercisable (vested) as of June 30, 2018:

 
Options
Outstanding
Options
Exercisable
Number of options
8,093,343

5,689,985

Weighted average remaining contractual term (in years)
6.18

5.13

Weighted average exercise price
$
12.11

$
8.00

Weighted average fair value
$
8.52

$
5.68

Aggregate intrinsic value (in thousands)
$
88,348

$
83,067
Restricted Stock Unit (RSU) Activity
The following table summarizes restricted stock unit and restricted stock award activity during the six-month period ending June 30, 2018:

 
Number of Shares
Weighted Average Grant Date Fair Value per Share
Outstanding January 1, 2018
24,150

$
26.45

Granted
—

—

Forfeited
—

—

Vested/released
(8,050
)
26.45

Outstanding June 30, 2018
16,100

26.45
Equity-Based Compensation Expenses
Equity-based compensation is summarized below (in thousands):

 
Three Months Ended
Six Months Ended
 
June 30,
June 30,
June 30,
June 30,
 
2018
2017
2018
2017
Cost of sales
$
58

$
22

$
104

$
22

Research and development
838

1,166

2,450

1,892

Sales, general and administrative
2,513

3,047

6,457

5,536

Equity-based compensation expense
$
3,409

$
4,235

$
9,011

$
7,450