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12.5% Senior Secured Notes and Loans Payable - Narrative (Details)				12 Months Ended
	Oct. 07, 2021 USD ($)	Nov. 03, 2020 USD ($) vestingPeriod shares	Jul. 15, 2019 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 16, 2022 USD ($)	Nov. 04, 2022 USD ($)	May 15, 2022 vestingPeriod	Aug. 06, 2021 USD ($) shares	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Warrants issued (in shares) \| shares			2,000,000
Exercise price of warrants (in usd per share) \| $ / shares			$ 0.001
Net proceeds from issuance of initial notes, warrants and first offer rights			$ 66,082,000
Number of transactions \| vestingPeriod		2
Premium on early retirement of debt		$ 2,250,000
Consent fee payment				$ 2,025,000	$ 0
Loss on the extinguishment of debt				0	13,822,000
Amortization of debt issuance costs and discounts				$ 215,000	3,731,000
Maximum \| Marathon Pangolin Royalty LLC
Debt Instrument [Line Items]
Percentage of cash proceeds			30.00%
Senior Notes
Debt Instrument [Line Items]
Proceeds from issuance of debt		4,000,000
Payments of loan costs		$ 220,000
Senior Secured Notes Due 2025
Debt Instrument [Line Items]
Interest rate				12.50%
Principal amount			$ 70,000,000
Warrants issued (in shares) \| shares									714,000
Warrants issued to purchase common stock (in shares) \| shares		143,000,000
Additional borrowing capacity									$ 30,000,000
Redemption percentage of debt under change of control provisions			101.00%
Debt instrument, amount redeemed						$ 1,882,000	$ 3,765,000
Amortization of debt issuance costs and discounts				$ 16,000	3,572,000
Unamortized deferred debt issuance cost and deferred debt discounts				27,000	43,000
Senior Secured Notes Due 2025 \| Put Option
Debt Instrument [Line Items]
Fair value				$ 45,000
Senior Secured Notes Due 2025 \| Put Option \| Other Noncurrent Liabilities
Debt Instrument [Line Items]
Fair value					98,000
Senior Secured Notes Due 2025 \| Maximum
Debt Instrument [Line Items]
Principal amount			$ 100,000,000
Elective redemption percentage of debt			112.50%
Senior Secured Notes Due 2025 \| Minimum
Debt Instrument [Line Items]
Elective redemption percentage of debt			101.56%
Senior Secured Notes Due 2025 \| Senior Notes
Debt Instrument [Line Items]
Interest rate			12.50%	12.50%
Retirement of debt		$ 22,500,000
Long-term debt		$ 70,000,000		$ 51,500,000						$ 51,500,000
Repurchase price percentage			112.50%
Consent fee payment	$ 2,700,000
Number of quarterly payments \| vestingPeriod								4
Loss on the extinguishment of debt					$ 13,822,000
Senior Secured Notes Due 2025 - First Additional Offering
Debt Instrument [Line Items]
Additional borrowing capacity									10,000,000
Senior Secured Notes Due 2025 - First Additional Offering \| Maximum
Debt Instrument [Line Items]
Warrants issued (in shares) \| shares				2,143,000
Senior Secured Notes Due 2025 - Second Additional Offering
Debt Instrument [Line Items]
Additional borrowing capacity									$ 20,000,000