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Interim Financial Statements - Additional Information (Details) oz in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 09, 2017 | Mar. 31, 2018 USD ($) oz | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Annual gold-equivalent production (in ounces) | oz |  | 20 |  |  |
Accumulated deficit |  | $ 225,089,320 |  | $ 222,604,417 |
Net loss |  | 2,484,903 | $ 2,774,180 |  |
Net cash used in operating activities |  | 1,098,927 | 1,959,814 |  |
Cash and cash equivalents |  | 2,027,789 | $ 388,571 | 2,066,718 | $ 184,359
Current assets |  | 7,667,578 |  | 7,731,508 |
Current liabilities |  | 1,579,239 |  | $ 1,109,485 |
Current assets in excess of current liabilities |  | 6,100,000 |  |  |
Unused borrowing capacity |  | 7,000,000 |  |  |
Reverse stock split conversion ratio | 0.2 |  |  |  |
Purchase Agreement | Leviston Resources LLC |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Remaining amount available for issuance under agreement |  | $ 3,200,000 |  |  |

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