Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands					1 Months Ended	2 Months Ended	12 Months Ended
	Jan. 05, 2024 USD ($)	Nov. 14, 2023 $ / shares shares	Mar. 15, 2022 shares	Mar. 14, 2022	Dec. 31, 2023 USD ($) $ / shares shares	Mar. 13, 2024 USD ($) shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Mar. 11, 2022 shares
Financing Receivable, Impaired [Line Items]
Cash and cash equivalents					$ 106,200		$ 106,200
Working capital					$ 101,800		101,800
Number of shares issued (in shares) | shares					523,328
Consideration received, net of issuance costs					$ 1,100
Amount available for issuance under the ATM plan					$ 360,300		$ 360,300
Split conversion ratio		0.1	0.1	0.1
Common stock, par value (in USD per share) | $ / shares		$ 0.0001			$ 0.0001		$ 0.0001	$ 0.0001
Common stock, authorized (in shares) | shares		1,400,000,000			1,400,000,000		1,400,000,000	1,400,000,000	1,400,000,000
Preferred stock, shares authorized (in shares) | shares		10,000,000
Restricted cash					$ 26,340		$ 26,340	$ 33,982
Production related costs								13,328
Capitalized depreciation and amortization								392
Mine site period costs – Note 2								13,720
Cash interest paid							6,212	$ 5,318
At-The-Market Offering
Financing Receivable, Impaired [Line Items]
Consideration received, net of issuance costs							$ 133,500
Subsequent event
Financing Receivable, Impaired [Line Items]
Number of shares issued (in shares) | shares						265,985
Consideration received, net of issuance costs						$ 600
Amount available for issuance under the ATM plan						$ 359,700
The 1.25 Lien Notes | Subsequent event
Financing Receivable, Impaired [Line Items]
Principal prepaid	$ 34,700
Total payment	38,000
Cash interest paid	$ 3,300
Common Stock
Financing Receivable, Impaired [Line Items]
Number of shares issued (in shares) | shares					523,328
Consideration received, net of issuance costs					$ 1,100
Common Stock | At-The-Market Offering
Financing Receivable, Impaired [Line Items]
Number of shares issued (in shares) | shares			8,955,358