Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Other income (expense)
Gain on sale of patents	$ 3,641	$ 0	$ 3,641	$ 0
Gain on non-refundable deposit	109	0	1,550	0
Fair value adjustments to warrants – Notes 13 and 20	1	59	7	181
Write-down of supplies inventories	0	0	(12)	0
Gain (loss) on sale of equipment	0	85	(131)	85
Unrealized loss on securities	(490)		(490)	0
Total	$ 3,261	$ 144	$ 4,565	$ 266

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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Amount of gain (loss) on sale or disposal of intangible assets.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Amount of income (expense) related to nonoperating activities, classified as other.

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