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Employee Equity-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Activity
The following table summarizes option activity under all plans during the three months ended March 31, 2019:

 
Number of Shares
Weighted Average Exercise Price per Share
Options Outstanding January 1, 2019
8,090,636

$
12.22

Granted
1,468,949

11.66

Forfeited
(169,423
)
21.05

Exercised
(208,044
)
17.68

Expired
(22,576
)
23.27

Options Outstanding March 31, 2019
9,159,542

$
11.81
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
 
March 31,
March 31,
 
2019
2018
Expected term (in years)
6.17

6.11

Volatility
62
%
68
%
Expected dividends
—

—

Risk free interest rates
2.59
%
2.69
%
Weighted average fair value
$
6.90

$
16.25
Stock Option Supplemental Information
The following table shows summary information for outstanding options and options that are exercisable (vested) as of March 31, 2019:

 
Options
Outstanding
Options
Exercisable
Number of options
9,159,542

5,987,089

Weighted average remaining contractual term (in years)
6.08

4.63

Weighted average exercise price
$
11.81

$
8.75

Weighted average fair value
$
7.91

$
5.95

Aggregate intrinsic value (in thousands)
$
92,541

$
76,978
Restricted Stock Unit (RSU) Activity
The following table summarizes RSU and restricted stock award activity during the three months ended March 31, 2019:

 
Number of Shares
Weighted Average Grant Date Fair Value per Share
Outstanding January 1, 2019
76,000

$
18.70

Granted
11,000

20.32

Forfeited
(50,000
)
20.80

Vested/released
(7,000
)
19.47

Outstanding March 31, 2019
30,000

15.62
Equity-Based Compensation Expenses
Equity-based compensation is summarized below (in thousands):

 
Three Months Ended
 
March 31,
March 31,
 
2019
2018
Cost of sales
$
55

$
46

Research and development
1,527

1,612

Sales, general and administrative
1,815

3,944

Equity-based compensation expense
$
3,397

$
5,602