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Goodwill and Intangible Assets, Net
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, Net Goodwill and Intangible Assets, Net
The changes in the carrying amount of goodwill for the years ended December 31, 2019 and 2018 were as follows (in thousands):
Balance as of January 1, 2018
$—  
Additions
152,085  
Balance as of December 31, 2018
$152,085  
Additions
10,947  
Foreign currency translation and other adjustments(4,307) 
Balance as of December 31, 2019
$158,725  

Intangible assets, net consisted of the following as of the dates indicated (in thousands):
December 31, 2019
Weighted-average
Remaining Useful
Life (Years)		Gross Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
Developed technology and patents
1.6$42,887  $26,309  $16,578  
Contractual relationship – cities and user relationships
7.779,800  13,459  66,341  
Total intangible assets$122,687  $39,768  $82,919  

December 31, 2018
Weighted-average
Remaining Useful
Life (Years)		Gross Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
Developed technology and patents
2.6$42,887  $3,924  $38,963  
Contractual relationship – cities and user relationships
8.779,800  1,030  78,770  
Total intangible assets$122,687  $4,954  $117,733  

Amortization expense was $35.1 million and $4.8 million for the years ended December 31, 2019 and 2018, respectively.
As of December 31, 2019, future amortization of intangible assets that will be recorded in cost of revenue and operating expenses is estimated as follows (in thousands).
Year ended December 31:
2020$24,673  
202112,589  
20226,442  
20235,639  
20245,639  
 Thereafter
27,937  
   Total remaining amortization$82,919