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Intangible Assets, Net and Other non-current Assets | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net and Other non-current Assets | Intangible Assets, Net and Other non-current Assets The following table provides the components of identifiable intangible assets, all of which are finite lived:
| June 30, 2021 |  | December 31, 2020
Purchased technology-based intangible | $ | 2,358 |  |  | $ | 2,358 |
Purchased patent | 509 |  |  | 509 |
| 2,867 |  |  | 2,867 |
Less: accumulated amortization | (2,791) |  |  | (2,765) |
Intangible assets, net | 76 |  |  | 102 |
Royalty receivable | 6,000 |  |  | 7,000 |
Other | 908 |  |  | 836 |
Total other non-current assets | $ | 6,908 |  |  | $ | 7,836 |
Amortization expense was $12 and $12 for each of the three-month periods ended June 30, 2021 and 2020. For the corresponding six-month periods, these expenses totaled $25 and $25, respectively. During the remaining life of the purchased patent, estimated annual amortization expense is $50 for each of the years from 2021 to 2022. During the second quarter of 2020, under the Sunovion License Agreement, the Company recognized $8,000 of royalty revenue and corresponding royalty receivable, related to the $1,000 annual minimum guaranteed royalty that is due in each of the next eight years. In connection with the Monetization Agreement, the Company performed an assessment under ASC 860 Transfer and Servicing to determine whether the existing receivable was transferred to Marathon and concluded it was not transferred. Royalty receivable consists of seven annual minimum payments due from Sunovion, the last of which is due in March 2028. The current portion of the royalty receivable is included in Trade and other receivables, net. See Note 15 Sale of Future Revenue for further details on how this receivable relates to the Monetization transaction.

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- Definition The entire disclosure for goodwill and 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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