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Liquidity (Details Narrative) - USD ($) |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 25, 2017 | Apr. 14, 2017 | Feb. 16, 2017 | Jan. 19, 2017 | Jan. 05, 2017 | Dec. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Working capital |  |  |  |  |  | $ 3,900,000 |  |  | $ 3,900,000 | $ 4,200,000
Increase in working capital |  |  |  |  |  |  |  |  | 8,100,000 |
Net proceeds from direct offering |  |  |  | $ 8,900,000 |  | 2,000,000 | $ 4,500,000 | $ 8,900,000 |  |
Number of common stock issued |  |  |  | 1,399,140 |  |  |  |  |  |
Number of common shares issued value |  |  |  |  |  |  |  |  | 15,321,000 | $ 13,949,000
Aspire Capital Fund LLC [Member] |  |  |  |  |  |  |  |  |  |
Net proceeds from direct offering | $ 22,000,000 |  | $ 4,500,000 |  |  |  |  |  |  |
Number of common stock issued | 880,000 |  | 2,100,000 |  |  |  |  |  |  |
Common Stock Purchase Agreement [Member] | Aspire Capital Fund LLC [Member] |  |  |  |  |  |  |  |  |  |
Number of common stock shares issued to commitment fee | 880,000 |  |  |  |  |  |  |  |  |
Common Stock Purchase Agreement [Member] | Aspire Capital Fund LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Available for future sales | $ 22,000,000 |  |  |  |  |  |  |  |  |
Sale of common stock shares | 5,033,677 |  |  |  |  |  |  |  |  |
Common Stock Purchase Agreement [Member] | Aspire Capital Fund LLC [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Average price per shares issued | $ 1.38 |  |  |  |  |  |  |  |  |
March 1, 2018 [Member] | Common Stock Purchase Agreement [Member] | Aspire Capital Fund LLC [Member] |  |  |  |  |  |  |  |  |  |
Available for future sales |  |  |  |  |  | 19,800,000 |  |  | $ 19,800,000 |
Number of common stock shares limited to current Exchange Cap |  |  |  |  |  |  |  |  | 2,600 |
ATM Offering [Member] |  |  |  |  |  |  |  |  |  |
Net proceeds from direct offering |  | $ 30,000,000 |  |  |  |  |  |  |  |
Number of common stock issued |  | 812,723 |  |  |  |  |  |  |  |
RCF Loan [Member] |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  | $ 5,500,000 |
Laramide Resources Ltd [Member] |  |  |  |  |  |  |  |  |  |
Cash balance |  |  |  |  |  | 2,200,000 |  |  | 2,200,000 |
Promissory debt |  |  |  |  |  | $ 5,000,000 |  |  | $ 5,000,000 |
Number of common stock issued |  |  |  |  | 2,218,333 |  |  |  | 2,218,333 |
Number of common shares issued value |  |  |  |  |  |  |  |  | $ 900,000 |
Warrant to purchase of common stock |  |  |  |  | 2,218,333 | 2,218,333 |  |  | 2,218,333 |
Fair value of warrants |  |  |  |  |  |  |  |  | $ 500,000 |
Laramide Resources Ltd [Member] | January 2018 [Member] |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  | $ 1,500,000 |
Cantor Fitzgerald & Co [Member] | ATM Offering [Member] |  |  |  |  |  |  |  |  |  |
Net proceeds from direct offering |  | $ 30,000,000 |  |  |  |  |  |  |  |
Cantor Fitzgerald & Co [Member] | ATM Offering [Member] | March 1, 2018 [Member] |  |  |  |  |  |  |  |  |  |
Available for future sales |  | $ 28,800,000 |  |  |  |  |  |  |  |

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