Debt, Net - Narrative (Details)					12 Months Ended
		Oct. 31, 2020 USD ($)	May 29, 2020 USD ($) $ / shares shares	May 28, 2020 USD ($) shares	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) shares		Nov. 09, 2021 USD ($)	Nov. 08, 2021 USD ($)	Oct. 04, 2019 USD ($)
Debt Instrument [Line Items]
Percentage of stock issued to creditors			1.00%
Unamortized discount					$ 10,024,000	$ 14,700,000
Share price (in dollars per share) | $ / shares					$ 0.61
Common shares issued						1,000
Proceeds from sales of equipment		$ 2,300,000			$ 117,000	2,315,000
2.0 Lien Notes to common stock
Debt Instrument [Line Items]
Common shares issued upon conversion	[1]					220,859,000
Debt conversion, number of shares issued | shares				132,800,000
Exchange of Seller's 1.5 Lien Notes for HYMC common stock
Debt Instrument [Line Items]
Debt converted					0	160,254,000
Debt conversion, number of shares issued | shares			16,025,316
Exchange of Seller's 1.25 Lien Notes for HYMC common stock
Debt Instrument [Line Items]
Debt converted					0	48,459,000
Common shares issued upon conversion						48,459,000
Debt conversion, number of shares issued | shares			4,845,920
1.5 Lien Notes into common stock
Debt Instrument [Line Items]
Common shares issued upon conversion						$ 145,685,000
Common Stock
Debt Instrument [Line Items]
Number of shares issued (in shares) | shares	[2]					101
Common Stock | 2.0 Lien Notes to common stock
Debt Instrument [Line Items]
Common shares issued upon conversion	[1],[2]					$ 2,000
Common shares issued upon conversion (in shares) | shares	[1],[2]					14,795,153
Common Stock | Exchange of Seller's 1.25 Lien Notes for HYMC common stock
Debt Instrument [Line Items]
Common shares issued upon conversion (in shares) | shares	[2]					4,845,920
Common Stock | 1.5 Lien Notes into common stock
Debt Instrument [Line Items]
Common shares issued upon conversion	[2]					$ 2,000
Common shares issued upon conversion (in shares) | shares	[2]					16,025,316
Additional Paid-in Capital
Debt Instrument [Line Items]
Common shares issued	[2]					$ 1,000
Additional Paid-in Capital | 2.0 Lien Notes to common stock
Debt Instrument [Line Items]
Common shares issued upon conversion	[1],[2]					146,217,000
Additional Paid-in Capital | Exchange of Seller's 1.25 Lien Notes for HYMC common stock
Debt Instrument [Line Items]
Common shares issued upon conversion	[2]					48,459,000
Additional Paid-in Capital | 1.5 Lien Notes into common stock
Debt Instrument [Line Items]
Common shares issued upon conversion	[2]					160,252,000
Accumulated Deficit | 2.0 Lien Notes to common stock
Debt Instrument [Line Items]
Common shares issued upon conversion	[1]					74,640,000
Accumulated Deficit | 1.5 Lien Notes into common stock
Debt Instrument [Line Items]
Common shares issued upon conversion						(14,569,000)
Sprott credit agreement, noncurrent portion
Debt Instrument [Line Items]
Share price (in dollars per share) | $ / shares			$ 12.65
Common shares issued						$ 6,282,000
Sprott credit agreement, noncurrent portion | Common Stock
Debt Instrument [Line Items]
Number of shares issued (in shares) | shares			496,634			496,634	[2]
Sprott credit agreement, noncurrent portion | Additional Paid-in Capital
Debt Instrument [Line Items]
Common shares issued			$ 6,300,000			$ 6,282,000	[2]
Subordinated debt
Debt Instrument [Line Items]
Stated interest rate			10.00%
Notes payable | Conversion of 1.25 Lien Notes to New Subordinated Notes
Debt Instrument [Line Items]
Stated interest rate			10.00%
Debt conversion, amount			$ 80,000,000
Sprott credit agreement, noncurrent portion
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 110,000,000
Stated amount of borrowing			$ 70,000,000
Debt, original issue discount (percent)			2.00%
Original issue discount			$ 1,400,000
Remaining borrowing capacity			40,000,000
Proceeds from issuance of debt			62,300,000		$ 0	68,600,000
Interest obligation			9,300,000
Unamortized discount			$ 17,000,000
Stated interest rate			7.00%		8.50%
Basis spread on variable rate			1.50%
Periodic payment, first twelve months			$ 0
Percentage of interest capitalized			100.00%
Quarterly interest payable			$ 500,000
Periodic payment term			3 months
First four principal repayments, percentage of outstanding principal			2.50%
Subsequent principal repayments, percentage of outstanding principal			7.50%
Debt term			5 years
Amount of debt repurchased		$ 1,200,000
Sprott credit agreement, noncurrent portion | Minimum
Debt Instrument [Line Items]
Early repayment premium			3.00%
Payment terms, percent of proceeds received					50.00%
Sprott credit agreement, noncurrent portion | Maximum
Debt Instrument [Line Items]
Early repayment premium			5.00%
Payment terms, percent of proceeds received					100.00%
Sprott credit agreement, noncurrent portion | Credit facility
Debt Instrument [Line Items]
Minimum unrestricted cash								$ 9,000,000	$ 10,000,000
Stated amount of borrowing			$ 70,000,000
Debt, original issue discount (percent)			2.00%
The 1.25 Lien notes
Debt Instrument [Line Items]
Proceeds from issuance of debt					$ 0	$ 44,841,000
Business combination pursuant lien exchange agreement			1.25
The 1.25 Lien notes | Conversion of 1.25 Lien Notes to New Subordinated Notes
Debt Instrument [Line Items]
Business combination pursuant lien exchange agreement			1.25
Debt converted			$ 80,000,000
2.0 Lien Notes | Notes payable | 2.0 Lien Notes to common stock
Debt Instrument [Line Items]
Stated interest rate			15.00%
Debt converted			$ 221,300,000	$ 221,300,000
Conversion price (percent)				1.67
1.5 Lien Notes | Notes payable | Exchange of Seller's 1.5 Lien Notes for HYMC common stock
Debt Instrument [Line Items]
Stated interest rate			15.00%
Debt converted			$ 145,700,000
Repurchase price (percent)			110.00%
Percentage of aggregate debt principal converted (percent)			10.00%
1.25 Lien Notes | Notes payable | Conversion of 1.25 Lien Notes to New Subordinated Notes
Debt Instrument [Line Items]
Debt converted			$ 80,000,000
1.25 Lien Notes | Notes payable | Exchange of Seller's 1.25 Lien Notes for HYMC common stock
Debt Instrument [Line Items]
Stated interest rate			15.00%
Debt converted			$ 48,500,000
First Lien Agreement | Notes payable
Debt Instrument [Line Items]
Amount of debt repurchased			$ 125,500,000
First Lien Agreement | Notes payable | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			7.50%
First Lien Agreement | Notes payable | Alternate Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate			7.50%
Promissory Note | Notes payable
Debt Instrument [Line Items]
Amount of debt repurchased			$ 6,900,000

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

[2] 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.