Intangible Assets, Net and Other non-current Assets

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

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.