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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Consolidated Balance Sheets [Abstract]    
Accounts receivable, less allowance for doubtful accounts $ 14us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable-related party, allowance for doubtful accounts $ 159tgc_AllowanceForDoubtfulAccountsDueFromRelatedPartiesCurrent $ 257tgc_AllowanceForDoubtfulAccountsDueFromRelatedPartiesCurrent
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 60,842,413us-gaap_CommonStockSharesIssued 60,842,413us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 60,842,413us-gaap_CommonStockSharesOutstanding 60,842,413us-gaap_CommonStockSharesOutstanding