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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration