CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands		Total	Conversion from Class B common stock	Private placement	Sprott credit agreement, noncurrent portion	Public Offering	2.0 Lien Notes to common stock	[2]	1.5 Lien Notes into common stock	Exchange of Seller's 1.25 Lien Notes for HYMC common stock	Common Stock		Common Stock Conversion from Class B common stock	Common Stock Private placement		Common Stock Sprott credit agreement, noncurrent portion	Common Stock Public Offering		Common Stock 2.0 Lien Notes to common stock	[2]	Common Stock 1.5 Lien Notes into common stock		Common Stock Exchange of Seller's 1.25 Lien Notes for HYMC common stock	Treasury Stock		Treasury Stock 2.0 Lien Notes to common stock	[2]	Additional Paid-in Capital		Additional Paid-in Capital Conversion from Class B common stock	[1]	Additional Paid-in Capital Private placement	[1]	Additional Paid-in Capital Sprott credit agreement, noncurrent portion	[1]	Additional Paid-in Capital Public Offering	[1]	Additional Paid-in Capital 2.0 Lien Notes to common stock	[1],[2]	Additional Paid-in Capital 1.5 Lien Notes into common stock	[1]	Additional Paid-in Capital Exchange of Seller's 1.25 Lien Notes for HYMC common stock	[1]	Accumulated Deficit	Accumulated Deficit 2.0 Lien Notes to common stock	[2]	Accumulated Deficit 1.5 Lien Notes into common stock
Beginning balance (in shares) at Dec. 31, 2019	[1]										345,431													(22,103)
Beginning balance at Dec. 31, 2019		$ (439,251)									$ 0	[1]												$ 0	[1]			$ 5,187	[1]															$ (444,438)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common shares issued upon conversion (in shares)	[1]												4,813,180						14,795,153		16,025,316		4,845,920			(22,103)
Common shares issued upon conversion			$ 12,814				$ 220,859		$ 145,685	$ 48,459									$ 2	[1]	$ 2	[1]								$ 12,814								$ 146,217		$ 160,252		$ 48,459			$ 74,640		$ (14,569)
Common shares issued (in shares)	[1]										101			7,596,309		496,634	9,583,334
Common shares issued		1		$ 75,963	$ 6,282	$ 83,514								$ 1	[1]		$ 1	[1]										1	[1]			$ 75,962		$ 6,282		$ 83,513
Unredeemed SPAC shares of MUDS public stockholders (in shares)	[1]										1,197,704
Unredeemed SPAC shares of MUDS public stockholders		3,723																										3,723	[1]
Common shares issued to underwriter (in shares)	[1]										44,395
Common shares issued to underwriter		444																										444	[1]
Vesting of restricted stock units	[3]	1,802																										1,802	[1]
Equity issuance costs		(8,255)																										(8,255)	[1]
Stock-based compensation costs		388																										388	[1]
Private Warrants transferred to Public Warrants		581																										581	[1]
Shares issued under stock-based compensation program (in shares)	[1]										157,829
Shares issued under stock-based compensation program		0
Net loss		(136,392)																																										(136,392)
Ending balance (in shares) at Dec. 31, 2020	[1]										59,901,306													0
Ending balance at Dec. 31, 2020		16,617									$ 6	[1]												$ 0	[1]			537,370	[1]															(520,759)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock units (in shares)	[1]										394,589
Vesting of restricted stock units		765																										765	[1]
Stock-based compensation costs		2,185																										2,185	[1]
Stock issuance - other (in shares)											137,500
Stock issuance - other		209																										209
Private Warrants transferred to Public Warrants	[1]	294
Net loss		(88,564)																																										(88,564)
Ending balance (in shares) at Dec. 31, 2021	[1]										60,433,395													0
Ending balance at Dec. 31, 2021		$ (68,494)									$ 6	[1]												$ 0	[1]			$ 540,823	[1]															$ (609,323)

[1] Retroactively restated January 1, 2020 and March 31, 2020 for the reverse recapitalization as described in Note 2 - Summary of Significant Accounting Policies, and the restated reclassification of the Company's 5-Year Private Warrants as described in Note 12 - Warrant Liabilities.

[2] Includes 3,511,820 shares of HYMC common stock received by Seller that were surrendered by the Company.

[3] As of December 31, 2021 there were 21,256 unissued shares underlying restricted stock units that had vested but have not been converted into issued and outstanding shares of common stock.