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Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2019
Marketable Securities  
Summary of marketable securities portfolio

The following is a summary of our marketable security portfolio for the periods presented (in thousands):

Net

Net

Amortized

Unrealized

Unrealized

Estimated

    

Cost

    

Gains

    

Losses

    

Fair Value

 

December 31, 2019

    

    

    

    

Debt securities (corporate and government)

$

284,795

$

75

$

$

284,870

December 31, 2018

Debt securities (corporate and government)

$

275,405

$

$

(1,062)

$

274,343

Schedule of fair value of assets measured on recurring basis

The following fair value hierarchy table presents information about each major category of our financial assets measured at fair value on a recurring basis (in thousands):

Fair Value Measurement at Reporting Date Using:

Quoted Prices in

Significant Other

Significant

Active Markets for

Observable

Unobservable

Identical Assets

Inputs

Inputs

Balance as of

    

(Level 1)

    

(Level 2)

    

(Level 3)

    

December 31, 2019

 

Cash and cash equivalents

$

1,832,684

$

$

$

1,832,684

Debt securities (corporate and government)

 

 

284,870

 

 

284,870

Long term investments (Note 6)

 

133,657

 

 

 

133,657

Total assets

$

1,966,341

$

284,870

$

$

2,251,211

Fair Value Measurement at Reporting Date Using:

Quoted Prices in

Significant Other

Significant

Active Markets for

Observable

Unobservable

Identical Assets

Inputs

Inputs

Balance as of

    

(Level 1)

    

(Level 2)

    

(Level 3)

    

December 31, 2018

 

Cash and cash equivalents

$

1,163,980

$

$

$

1,163,980

Debt securities (corporate and government)

 

274,343

 

274,343

Long term investments (Note 6)

 

99,199

 

 

 

99,199

Total assets

$

1,263,179

$

274,343

$

$

1,537,522

Schedule of fair value of liabilities measured on recurring basis

The following fair value hierarchy table presents information about each major category of our financial liabilities measured at fair value on a recurring basis (in thousands):

Fair Value Measurement at Reporting Date Using:

Quoted Prices in

Significant Other

Significant

Active Markets for

Observable

Unobservable

                                

Identical Liabilities

Inputs

Inputs

Balance as of

    

(Level 1)

    

(Level 2)

    

(Level 3)

    

December 31, 2019

Acquisition-related contingent consideration

$

$

$

277,000

$

277,000

Total liabilities

$

$

$

277,000

$

277,000

Fair Value Measurement at Reporting Date Using:

Quoted Prices in

Significant Other

Significant

Active Markets for

Observable

Unobservable

Identical Liabilities

Inputs

Inputs

Balance as of

    

(Level 1)

    

(Level 2)

    

(Level 3)

    

December 31, 2018

Acquisition-related contingent consideration

$

$

$

287,001

$

287,001

Total liabilities

$

$

$

287,001

$

287,001

Schedule of roll forward of Level 3 liabilities

The following is a roll forward of our Level 3 liabilities (in thousands):

2019

2018

Balance at January 1,

$

287,001

$

287,000

Contingent consideration earned during the period but not yet paid

(23,012)

(13,184)

Payments made during the period

(6,671)

(12,988)

Change in fair value of contingent consideration

19,682

26,173

Balance at December 31,

$

277,000

$

287,001