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v3.19.1

Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities and Deferred Credits (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Other long-term liabilities and deferred credits |  | $ 500 | $ 500
Royalties Payable [Member] |  |  |
Other long-term liabilities and deferred credits | [1] | $ 500 | $ 500
[1] | Royalties payable were derived during prior years of production. Liabilities do not accrue interest or have a stated maturity date.

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- Definition Carrying amount as of the balance sheet date of unearned revenue or income, not otherwise specified in the taxonomy, which is expected to be taken into income after one year or beyond the normal operating cycle, if longer and noncurrent obligations not separately disclosed in the balance sheet (other liabilities, noncurrent). + References No definition available. + Details
Name: | us-gaap_DeferredCreditsAndOtherLiabilitiesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=wwr_RoyaltiesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |