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UNAUDITED SUPPLEMENTARY QUARTERLY INFORMATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unaudited supplementary quarterly information
Revenues									$ 104,789	$ 117,019	$ 128,175
Gross (loss) profit	$ (13,687)	$ (701)	$ (8,875)	$ (3,685)	$ 1,261	$ 1,619	$ 4,677	$ 1,429	(26,948)	8,986	32,082
Net loss	$ (23,542)	$ (9,778)	$ (19,814)	$ (99,191)	$ (25,132)	$ (11,465)	$ (13,014)	$ (10,136)	$ (152,325)	$ (59,747)	$ (44,870)
Net (loss) per share:
Basic and diluted (in dollars per share)	$ (0.06)	$ (0.02)	$ (0.05)	$ (0.25)	$ (0.07)	$ (0.03)	$ (0.04)	$ (0.02)	$ (0.38)	$ (0.17)	$ (0.13)
Weighted average shares outstanding:
Basic and diluted (in shares)	408,959	403,887	400,513	400,370	378,543	362,175	346,998	345,497	403,457	361,845	337,297
Gold and silver sales
Unaudited supplementary quarterly information
Revenues	$ 27,703	$ 27,395	$ 18,291	$ 31,400	$ 32,362	$ 32,691	$ 36,383	$ 15,583	$ 104,789	$ 117,019	$ 128,175

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