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Business Combination (Tables)
 12 Months Ended
Dec. 31, 2019
Business Combinations [Abstract]  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
The following table summarizes the purchase price allocation of the business acquisitions during the fiscal years 2019, 2018 and 2017 based on estimated fair values of the acquired assets as of the acquisition date (in thousands);
Acquiree
 
Acquisition Date
 
Purchase Consideration
 
Net Tangible
 Assets Acquired/
(liabilities assumed)
 
Purchased Intangible Assets
 
Goodwill
 
Deferred Tax Liability
Adya
 
January 10,2019
 
$
1,000

 
$
—

 
$
900

 
$
100

 
$
—

Layered Insight
 
October 16, 2018
 
$
13,434

 
$
80

 
$
9,600

 
$
5,498

 
$
1,500

1Mobility
 
April 1, 2018
 
$
4,000

 
$
—

 
$
3,700

 
$
300

 
$
—

NetWatcher
 
November 28, 2017
 
$
7,729

 
$
80

 
$
7,000

 
$
649

 
$
—

Nevis
 
August 29, 2017
 
$
5,753

 
$
14

 
$
5,156

 
$
583

 
$
—