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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
The following table sets forth the changes in the carrying amount of goodwill for the three months ended March 31, 2021:

Amounts
Balance at December 31, 2020
$6,592 
Foreign currency translation adjustment19 
Balance at March 31, 2021
$6,611 
Schedule of finite-lived intangible assets
The changes in the carrying amount of intangible assets during the three months ended March 31, 2021 are as follows:

Amounts
Balance at December 31, 2020
$2,254 
Amortization expense(276)
Intangible assets acquired in asset acquisition16 
Foreign currency translation adjustment17 
Balance at March 31, 2021
$2,011 
Acquired intangible assets are subject to amortization. The following table summarizes acquired intangible assets at March 31, 2021 and December 31, 2020, respectively:
Gross Carrying AmountAccumulated AmortizationNet Carrying Value
March 31, 2021
Subscriber relationships$8,007 $6,154 $1,853 
Distribution rights314 156 158 
Internally developed software446 446 — 
Proprietary content153 153 — 
Intellectual property2,284 2,284 — 
$11,204 $9,193 $2,011 
December 31, 2020
Subscriber relationships$7,977 $5,958 $2,019 
Distribution rights311 76 235 
Internally developed software446 446 — 
Proprietary content153 153 — 
Intellectual property2,284 2,284 — 
$11,171 $8,917 $2,254 
As of March 31, 2021, the total weighted average remaining useful lives of the definite-lived intangible assets was 2.2 years and the weighted average remaining useful lives by the definite-lived intangible asset category are as follows:
Intangible AssetWeighted Average Remaining Useful Life in Years
Subscriber relationships2.3
Distribution rights0.5
Schedule of expected amortization expense
Estimated future amortization expense remaining at March 31, 2021 for intangible assets acquired was as follows:

Years ending December 31,
Remainder of 2021$747 
2022785 
2023312 
202452 
202552 
Thereafter63 
     Total future amortization expense$2,011