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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) | Total | Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Noncontrolling interest in Subsidiary | Mercury Clean Up LLC | Mercury Clean Up LLC Common Stock | Mercury Clean Up LLC Additional Paid-in Capital | Pelen LLC | Pelen LLC Additional Paid-in Capital
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  | 0 | 15,067,655 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 9,384,902 | $ 0 | $ 50,175 | $ 241,419,897 | $ (232,085,170) | $ 0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 1,090,400 |  |  |  |  |  |  |  |
Issuance of common stock | 813,561 |  | $ 3,631 | 809,930 |  |  |  |  |  |  |
Common stock issuance costs | (85,093) |  |  | (85,093) |  |  |  |  |  |  |
Net income (loss) | (1,835,065) |  |  |  | (1,835,065) |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2019 |  | 0 | 16,158,055 |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | 8,278,305 | $ 0 | $ 53,806 | 242,144,734 | (233,920,235) | 0 |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2018 |  | 0 | 15,067,655 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 9,384,902 | $ 0 | $ 50,175 | 241,419,897 | (232,085,170) | 0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (3,525,912) |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 0 | 23,246,040 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 8,888,947 | $ 0 | $ 77,409 | 244,422,620 | (235,611,082) | 0 |  |  |  |  |
Beginning balance (in shares) at Mar. 31, 2019 |  | 0 | 16,158,055 |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 | 8,278,305 | $ 0 | $ 53,806 | 242,144,734 | (233,920,235) | 0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 941,945 |  |  |  |  |  |  |  |
Issuance of common stock | 924,758 |  | $ 3,137 | 921,621 |  |  |  |  |  |  |
Common stock issuance costs | (374,885) |  |  | (374,885) |  |  |  |  |  |  |
Issuance of convertible preferred stock ( in shares) |  | 1,274 |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock | 1,515,000 | $ 1 |  | 1,514,999 |  |  |  |  |  |  |
Net income (loss) | (2,077,744) |  |  |  | (2,077,744) |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  | 1,274 | 17,100,000 |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | 8,265,434 | $ 1 | $ 56,943 | 244,206,469 | (235,997,979) | 0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 2,259,330 |  |  |  |  |  |  |  |
Issuance of common stock | 1,263,838 |  | $ 7,523 | 1,256,315 |  |  |  |  |  |  |
Issuance of common stock for convertible preferred (in shares) |  |  | 2,240,441 |  |  |  |  |  |  |  |
Issuance of common stock for convertible preferred | 1,515,000 |  | $ 7,461 | 1,507,539 |  |  |  |  |  |  |
Common stock issuance costs | (60,772) |  |  | (60,772) |  |  |  |  |  |  |
Preferred stock converted to common (in shares) |  | (1,274) |  |  |  |  |  |  |  |  |
Preferred stock converted to common | (1,515,000) | $ (1) |  | (1,514,999) |  |  |  |  |  |  |
Payment for mineral rights (in shares) |  |  | 746,269 |  |  |  |  |  |  |  |
Payment for mineral rights | 482,500 |  | $ 2,485 | 480,015 |  |  |  |  |  |  |
Investment in affiliate (in shares) |  |  |  |  |  |  |  | 900,000 |  |  |
Investment in affiliate |  |  |  |  |  |  | $ 751,050 | $ 2,997 | $ 748,053 |  |
Termination of share option with Tonogold | (2,200,000) |  |  | (2,200,000) |  |  |  |  |  |  |
Net income (loss) | 386,897 |  |  |  | 386,897 |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 0 | 23,246,040 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 8,888,947 | $ 0 | $ 77,409 | 244,422,620 | (235,611,082) | 0 |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2019 |  | 0 | 27,236,489 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 23,492,560 | $ 0 | $ 18,139 | 259,095,152 | (235,890,272) | 269,541 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 638,511 |  |  |  |  |  |  |  |
Issuance of common stock | 242,621 |  | $ 425 | 242,196 |  |  |  |  |  |  |
Common stock issuance costs | (50,070) |  |  | (50,070) |  |  |  |  |  |  |
Initial value of contingent forward | 1,232,952 |  |  | 1,232,952 |  |  |  |  |  |  |
Sale of membership interests in Comstock Mining LLC | 100,000 |  |  | 100,000 |  |  |  |  |  |  |
Net income (loss) | (263,212) |  |  |  | (263,212) |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2020 |  | 0 | 27,875,000 |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2020 | 24,754,851 | $ 0 | $ 18,564 | 260,620,230 | (236,153,484) | 269,541 |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2019 |  | 0 | 27,236,489 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 23,492,560 | $ 0 | $ 18,139 | 259,095,152 | (235,890,272) | 269,541 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 18,342,836 |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 0 | 34,440,766 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | 35,190,073 | $ 0 | $ 22,937 | 252,715,337 | (217,548,201) | 0 |  |  |  |  |
Beginning balance (in shares) at Mar. 31, 2020 |  | 0 | 27,875,000 |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 | 24,754,851 | $ 0 | $ 18,564 | 260,620,230 | (236,153,484) | 269,541 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Investment in affiliate (in shares) |  |  |  |  |  |  |  | 625,000 |  |  |
Investment in affiliate |  |  |  |  |  |  | $ 314,687 | $ 416 | $ 314,271 | $ 585,000 | $ 585,000
Director Compensation (in shares) |  |  | 315,000 |  |  |  |  |  |  |  |
Director compensation | 176,400 |  | $ 210 | 176,190 |  |  |  |  |  |  |
Employee share-based compensation | 27,849 |  |  | 27,849 |  |  |  |  |  |  |
Sale of membership interests in Comstock Mining LLC | 500,000 |  |  | 475,384 |  | 24,616 |  |  |  |  |
Net income (loss) | 1,275,986 |  |  |  | 1,275,986 |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2020 |  | 0 | 28,815,000 |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | 27,634,773 | $ 0 | $ 19,190 | 262,198,924 | (234,877,498) | 294,157 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 5,282,708 |  |  |  |  |  |  |  |
Issuance of common stock | 4,080,001 |  | $ 3,519 | 4,076,482 |  |  |  |  |  |  |
Common stock issuance costs | (205,000) |  |  | (205,000) |  |  |  |  |  |  |
Payment for mineral rights (in shares) |  |  | 343,058 |  |  |  |  |  |  |  |
Payment for mineral rights | 482,500 |  | $ 228 | 482,272 |  |  |  |  |  |  |
Termination of share option with Tonogold | (20,813,760) |  |  | (20,499,141) | (765) | (313,854) |  |  |  |  |
Sale of membership interests in Comstock Mining LLC | 6,681,497 |  |  | 6,661,800 |  | 19,697 |  |  |  |  |
Net income (loss) | 17,330,062 |  |  |  | 17,330,062 |  |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 0 | 34,440,766 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | $ 35,190,073 | $ 0 | $ 22,937 | $ 252,715,337 | $ (217,548,201) | $ 0 |  |  |  |  |

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