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Stock-Based Compensation - Allocation of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Stock-Based Compensation. |  |  |  |
Production costs | $ 20 | $ 15 | $ 12 | $ 29
General and administrative expenses | 201 | 161 | 424 | 340
Exploration expense | 28 | 7 | 49 | 14
Total stock-based compensation | $ 249 | $ 183 | $ 485 | $ 383

X
- Definition The portion of non-cash share-based compensation allocated to cost of revenue in the period. + References No definition available. + Details
Name: | goro_ShareBasedCompensationCostOfRevenue
Namespace Prefix: | goro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The portion of non-cash share-based compensation allocated to exploration expenses in the period. + References No definition available. + Details
Name: | goro_ShareBasedCompensationExplorationExpense
Namespace Prefix: | goro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The portion of non-cash share-based compensation allocated to general and administrative expenses in the period. + References No definition available. + Details
Name: | goro_ShareBasedCompensationGeneralAndAdministrativeExpenses
Namespace Prefix: | goro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration