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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Equity Compensation Goals
Eight Separate Revenue Goals (1)
(in thousands)
 
Eight Separate Adjusted EBITDA (CEO Performance Award) Goals
(in thousands)
Goal #1, $710,058
 
Goal #9, $125,000
Goal #2, $860,058
 
Goal #10, $155,000
Goal #3, $1,010,058
 
Goal #11, $175,000
Goal #4, $1,210,058
 
Goal #12, $190,000
Goal #5, $1,410,058
 
Goal #13, $200,000
Goal #6, $1,610,058
 
Goal #14, $210,000
Goal #7, $1,810,058
 
Goal #15, $220,000
Goal #8, $2,010,058
 
Goal #16, $230,000
(1) In connection with the business acquisition that was completed during the three months ended June 30, 2018 (Note 15), the revenue goals have been adjusted for the acquiree's Target Revenue, as defined in the CEO Performance Award agreement.
Summary of Restricted Stock Unit Activity
The following table summarizes RSU activity for the nine months ended September 30, 2018 (number of units and aggregate intrinsic value in thousands):
 
Number
of
Units
 
Weighted
Average
Grant-Date
Fair Value
 
Aggregate
Intrinsic Value
Units outstanding, beginning of year
2,348

 
$
23.47

 
 
Granted
341

 
45.52

 
 
Released
(556
)
 
23.62

 
 
Forfeited
(248
)
 
23.79

 
 
Units outstanding, end of period
1,885

 
27.45

 
$
128,991
Summary of the Stock Option Activity
The following table summarizes stock option activity for the nine months ended September 30, 2018 (number of units and aggregate intrinsic value in thousands):
 
Number
of
Options
 
Weighted
Average
Exercise
Price
 
Weighted Average Remaining Contractual Life (years)
 
Aggregate
Intrinsic Value
Options outstanding, beginning of year
804

 
$
4.99

 
 
 
 
Granted
6,366

 
28.58

 
 
 
 
Exercised
(445
)
 
5.26

 
 
 
 
Expired / terminated
(43
)
 
4.46

 
 
 
 
Options outstanding, end of period
6,682

 
27.45

 
9.23
 
$
238,748

Options exercisable, end of period
311

 
4.66

 
0.69
 
19,871

Options expected to vest, end of period
1,061

 


 

 
Stock-Based Compensation
The following table summarizes the composition of stock-based compensation for the three and nine months ended September 30, 2018 and 2017 (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Cost of products sold and services delivered
$
93

 
$
134

 
$
359

 
$
368

Sales, general and administrative expenses
3,748

 
2,099

 
8,783

 
6,282

Research and development expenses
2,414

 
1,767

 
6,160

 
4,773

Total stock-based compensation
$
6,255

 
$
4,000

 
$
15,302

 
$
11,423