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Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Deferred tax assets (DTAs):
Net operating loss and tax credit carryforwards	$ 107,523	$ 97,655
Unrealized mark-to-market, impairments and loss provisions	15,421	12,609
Other realized / unrealized treatment differences	(46,461)	(28,620)
Total deferred tax assets	76,483	81,644
Less: valuation allowance	(76,483)	(81,644)
Net deferred tax assets	$ 0	$ 0

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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-Topic 740
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

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-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-6

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