Significant Accounting Policies	9 Months Ended
Sep. 30, 2018
Significant Accounting Policies [Abstract]
Significant Accounting Policies	2. Significant Accounting Policies Revenue Recognition New FASB guidance issued under ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), as amended, is effective for interim and annual periods beginning after December 15, 2017. Under ASU No. 2014-09, an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU No. 2014-09 also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts. This includes significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. Effective January 1, 2018, the Company adopted the new guidance retrospectively. The Company performed an assessment of the revised guidance and the impacts on the Company’s Consolidated Financial Statements and disclosures. We also evaluated the potential for future variable consideration from option payments, net smelter return royalties (“NSR”), and other production related payments, and determined that there is no impact to the Company’s current accounting. The Company determined that the adoption of this guidance will primarily impact the timing of revenue recognition on certain option agreements based on the Company’s determination of when control is transferred for accounting purposes. Based on the contracts outstanding as of December 31, 2017, there was no cumulative effect adjustment required to be recognized at January 1, 2018. Under the Company’s adoption approach, results for reporting periods beginning after January 1, 2018, will be presented in the Consolidated Financial Statements under the new guidance, while prior period amounts will not be adjusted and continue to be reported under the guidance in effect for those periods. Currently, proceeds received from option agreements are ascribed to recovery of the carrying value of the related project until the carrying value reaches zero. After that, any additional proceeds received will be recognized as a contract liability until control has transferred to the buyer or the related contract has terminated. None of the projects which could provide the Company with future variable consideration are currently in production, and in all cases, we believe there is low probability of future production from these projects. Accordingly, the Company believes its NSRs and other production related payments are fully constrained, and the Company did not record a receivable for them. When it becomes probable that a project which could provide the Company with an NSR or other production related payments could begin production, the Company will evaluate the accounting treatment at that time. Lease Accounting In February 2016 the FASB issued ASU No. 2016-02, Leases. The new standard establishes a right-of-use (“ROU”) model that requires a lessee to record an ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for interim and annual periods beginning after December 15, 2018. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. Based upon our initial review, we expect to recognize additional operating liabilities of approximately $125 to $225 on adoption, with corresponding ROU assets of the same amount, based on the present value of the remaining lease payments. Nonemployee Share-Based Payments The FASB issued ASU No. 2018-07, Compensation - Stock Compensation (Topic 718) - Improvements to Nonemployee Share-Based Payment Accounting. ASU No. 2018-07, supersedes the guidance for equity-based payments to non-employees (Topic ASC 505-50). Under the new standard, an entity should treat equity-based payments to nonemployees the same as stock-based compensation to employees in most cases. The new guidance is effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted. Effective July 1, 2018, the Company adopted the new guidance. The Company performed an assessment of the standard and the impacts on the Company’s Consolidated Financial Statements and disclosures. Based on our analysis, adoption of the standard will not materially change the Company’s expense recognition and disclosures.

2. Significant Accounting Policies

Revenue Recognition

New FASB guidance issued under ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), as amended, is effective for interim and annual periods beginning after December 15, 2017. Under ASU No. 2014-09, an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU No. 2014-09 also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts. This includes significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract.

Effective January 1, 2018, the Company adopted the new guidance retrospectively. The Company performed an assessment of the revised guidance and the impacts on the Company’s Consolidated Financial Statements and disclosures. We also evaluated the potential for future variable consideration from option payments, net smelter return royalties (“NSR”), and other production related payments, and determined that there is no impact to the Company’s current accounting. The Company determined that the adoption of this guidance will primarily impact the timing of revenue recognition on certain option agreements based on the Company’s determination of when control is transferred for accounting purposes. Based on the contracts outstanding as of December 31, 2017, there was no cumulative effect adjustment required to be recognized at January 1, 2018. Under the Company’s adoption approach, results for reporting periods beginning after January 1, 2018, will be presented in the Consolidated Financial Statements under the new guidance, while prior period amounts will not be adjusted and continue to be reported under the guidance in effect for those periods.

Currently, proceeds received from option agreements are ascribed to recovery of the carrying value of the related project until the carrying value reaches zero. After that, any additional proceeds received will be recognized as a contract liability until control has transferred to the buyer or the related contract has terminated. None of the projects which could provide the Company with future variable consideration are currently in production, and in all cases, we believe there is low probability of future production from these projects. Accordingly, the Company believes its NSRs and other production related payments are fully constrained, and the Company did not record a receivable for them. When it becomes probable that a project which could provide the Company with an NSR or other production related payments could begin production, the Company will evaluate the accounting treatment at that time.

Lease Accounting

In February 2016 the FASB issued ASU No. 2016-02, Leases. The new standard establishes a right-of-use (“ROU”) model that requires a lessee to record an ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for interim and annual periods beginning after December 15, 2018. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. Based upon our initial review, we expect to recognize additional operating liabilities of approximately $125 to $225 on adoption, with corresponding ROU assets of the same amount, based on the present value of the remaining lease payments.

Nonemployee Share-Based Payments

The FASB issued ASU No. 2018-07, Compensation - Stock Compensation (Topic 718) - Improvements to Nonemployee Share-Based Payment Accounting. ASU No. 2018-07, supersedes the guidance for equity-based payments to non-employees (Topic ASC 505-50). Under the new standard, an entity should treat equity-based payments to nonemployees the same as stock-based compensation to employees in most cases. The new guidance is effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted. Effective July 1, 2018, the Company adopted the new guidance. The Company performed an assessment of the standard and the impacts on the Company’s Consolidated Financial Statements and disclosures. Based on our analysis, adoption of the standard will not materially change the Company’s expense recognition and disclosures.