Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets

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Intangible Assets
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The following table summarizes the carrying amount of intangible assets, net of accumulated amortization.
September 30, 2021
(in thousands) Gross Carrying
Value
Accumulated
Amortization
Net Carrying
Amount
Patents $ 1,471  $ (1,152) $ 319 
Acquired intellectual property and reacquired rights 15,125  (8,545) 6,580 
Internal-use software implementation costs 2,873  (846) 2,027 
$ 19,469  $ (10,543) $ 8,926 
December 31, 2020
(in thousands) Gross Carrying
Value
Accumulated
Amortization
Net Carrying
Amount
Patents $ 1,651  $ (1,203) $ 448 
Acquired intellectual property and reacquired rights 15,126  (7,770) 7,356 
Internal-use software implementation costs 1,675  (147) 1,528 
$ 18,452  $ (9,120) $ 9,332 
Amortization expense for the three months ended September 30, 2021 and 2020 was $0.5 million and $0.3 million, respectively, and for the nine months ended September 30, 2021 and 2020 was $1.6 million and $0.9 million, respectively.