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Intangible Assets | 3 Months Ended
--- | ---
Mar. 31, 2021
Intangible Assets |
Intangible Assets | Note 6. Intangible Assets Our patents and other intangible assets are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted- | ​ | At March 31, 2021
​ | ​ | Average | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortization | ​ | Carrying | ​ | Accumulated | ​ | Net
(In thousands) |  | Period | ​ | Amount | ​ | Amortization | ​ | Amount
Patents | ​ | 11 years | ​ | $ | 413 | ​ | $ | 74 | ​ | $ | 339
Defensive intangible assets | ​ | 4 years | ​ | ​ | 1,125 | ​ | ​ | 464 | ​ | ​ | 661
Customer accounts | ​ | 2 years | ​ |  | 125 | ​ |  | 70 | ​ |  | 55
Total amortizable intangible assets | ​ | ​ | ​ | ​ | 1,663 | ​ | ​ | 608 | ​ | ​ | 1,055
Patents pending | ​ | ​ | ​ | ​ | 628 | ​ | ​ | — | ​ | ​ | 628
Total intangible assets | ​ | ​ | ​ | $ | 2,291 | ​ | $ | 608 | ​ | $ | 1,683
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted- | ​ | At December 31, 2020
​ | ​ | Average | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortization | ​ | Carrying | ​ | Accumulated | ​ | Net
(In thousands) |  | Period | ​ | Amount | ​ | Amortization | ​ | Amount
Patents | ​ | 11 years | ​ | $ | 413 | ​ | $ | 65 | ​ | $ | 348
Defensive intangible assets | ​ | 4 years | ​ | ​ | 1,125 | ​ | ​ | 421 | ​ | ​ | 704
Customer accounts | ​ | 2 years | ​ |  | 125 | ​ |  | 63 | ​ |  | 62
Total amortizable intangible assets | ​ | ​ | ​ | ​ | 1,663 | ​ | ​ | 549 | ​ | ​ | 1,114
Patents pending | ​ | ​ | ​ | ​ | 566 | ​ | ​ | — | ​ | ​ | 566
Total intangible assets | ​ | ​ | ​ | $ | 2,229 | ​ | $ | 549 | ​ | $ | 1,680
​ Amortization expense was $0.1 million for each of the three months ended March 31, 2021 and 2020. Future amortization expenses are expected as follows: ​
​ | ​ | ​ | ​
(In thousands) | ​ | ​ | ​
2021 (April 1 - December 31) | ​ | $ | 177
2022 | ​ | ​ | 236
2023 | ​ |  | 205
2024 | ​ |  | 184
2025 | ​ |  | 94
Thereafter | ​ |  | 159
Total | ​ | $ | 1,055
​

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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