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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]        
Revenues - Note 14 $ 19,036,000 $ 11,146,000 $ 47,044,000 $ 13,709,000
Cost of sales:        
Production costs 17,817,000 8,957,000 41,688,000 11,041,000
Depreciation and amortization 1,041,000 1,334,000 2,894,000 1,011,000
Mine site period costs - Note 4 10,544,000 6,634,000 47,115,000 2,174,000
Write-down of production inventories - Note 4 0 6,965,000 17,924,000 16,443,000
Total cost of sales 29,402,000 23,890,000 109,621,000 30,669,000
Operating expenses:        
General and administrative 3,794,000 2,006,000 21,084,000 6,072,000
Projects and development 493,000 0 0 7,708,000
Accretion - Note 12 102,000 93,000 374,000 422,000
Loss from operations (14,755,000) (14,843,000) (89,366,000) (33,941,000)
Other income (expense):        
Interest expense, net of capitalized interest - Note 9 (4,449,000) (19,887,000) (43,458,000) (64,846,000)
Fair value adjustment to warrants - Note 19 9,493,000 0 (3,767,000) 0
Interest income 23,000 112,000 199,000 797,000
Loss before income taxes (9,688,000) (34,618,000) (136,392,000) (98,895,000)
Income taxes - Note 16 0 0 0 0
Net loss $ (9,688,000) $ (34,618,000) $ (136,392,000) $ (98,895,000)
Loss per share:        
Basic (in dollars per share) $ (0.16) $ (107.07) $ (3.92) $ (327.95)
Diluted (in dollars per share) $ (0.16) $ (107.07) $ (3.92) $ (327.95)
Weighted average shares outstanding:        
Basic (in shares) 59,901,306 [1] 323,328 [1] 34,833,211 [2] 301,559 [2]
Diluted (in shares) 59,901,306 [1] 323,328 [1] 34,833,211 [2] 301,559 [2]
[1] Retroactively restated March 31, 2020 for the reverse recapitalization. Refer to Note 3 - Recapitalization Transaction and Note 17 - Loss Per Share for further information.
[2] Retroactively restated for the reverse recapitalization. Refer to Note 2 - Summary of Significant Accounting Policies and Note 17 - Loss Per Share for further information.