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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 2021:

Amounts
Balance at December 31, 2020
$6,592 
Foreign currency translation adjustment30 
Balance at June 30, 2021
$6,622 
Schedule of finite-lived intangible assets
The changes in the carrying amount of intangible assets during the six months ended June 30, 2021 are as follows:

Amounts
Balance at December 31, 2020
$2,254 
Amortization expense(556)
Intangible assets acquired in asset acquisition32 
Foreign currency translation adjustment30 
Balance at June 30, 2021
$1,760 
Acquired intangible assets are subject to amortization. The following table summarizes acquired intangible assets at June 30, 2021 and December 31, 2020, respectively:
Gross Carrying AmountAccumulated AmortizationNet Carrying Value
June 30, 2021
Subscriber relationships$8,034 $6,354 $1,680 
Distribution rights316 236 80 
Internally developed software446 446 — 
Proprietary content153 153 — 
Intellectual property2,284 2,284 — 
$11,233 $9,473 $1,760 
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 June 30, 2021, the total weighted average remaining useful lives of the definite-lived intangible assets was 2.0 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 relationships2.0
Distribution rights0.3
Schedule of expected amortization expense
Estimated future amortization expense remaining at June 30, 2021 for intangible assets acquired was as follows:

Years ending December 31,
Remainder of 2021$481 
2022791 
2023316 
202454 
202554 
Thereafter64 
     Total future amortization expense$1,760