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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Equity Compensation Goals
Eight Separate Revenue Goals (1)
(in thousands)
 
Eight Separate Adjusted EBITDA-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 combination 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 six months ended June 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
281

 
40.79

 
 
Released
(436
)
 
24.08

 
 
Forfeited
(172
)
 
22.40

 
 
Units outstanding, end of period
2,021

 
25.89

 
$
127,687
Summary of the Stock Option Activity
The following table summarizes stock option activity for the six months ended June 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
(418
)
 
5.30

 
 
 
 
Expired / terminated
—

 
—

 
 
 
 
Options outstanding, end of period
6,752

 
27.21

 
9.40
 
$
242,866

Options exercisable, end of period
382

 
4.65

 
1.06
 
22,354

Options expected to vest, end of period
1,062

 


 

 
Stock-Based Compensation
The following table summarizes the composition of stock-based compensation for the three and six months ended June 30, 2018 and 2017 (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Cost of products sold and services delivered
$
125

 
$
155

 
$
266

 
$
234

Sales, general and administrative expenses
2,731

 
2,155

 
5,035

 
4,183

Research and development expenses
2,098

 
1,666

 
3,746

 
3,006

Total stock-based compensation
$
4,954

 
$
3,976

 
$
9,047

 
$
7,423