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ACCOUNTS RECEIVABLE/DUE TO LICENSORS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts receivable [Abstract]    
Gross accounts receivable $ 206us-gaap_AccountsReceivableGross $ 316us-gaap_AccountsReceivableGross
Allowance for doubtful accounts (4)us-gaap_AllowanceForDoubtfulAccountsReceivable (7)us-gaap_AllowanceForDoubtfulAccountsReceivable
Allowances for returns (6)four_AllowancesForReturns 0four_AllowancesForReturns
Accounts receivable, net 196us-gaap_AccountsReceivableNet 309us-gaap_AccountsReceivableNet
Less: long-term portion 0us-gaap_AccountsReceivableNetNoncurrent (1)us-gaap_AccountsReceivableNetNoncurrent
Accounts receivable, current 196us-gaap_AccountsReceivableNetCurrent 308us-gaap_AccountsReceivableNetCurrent
Gross accounts receivable, Product Sales 58four_GrossAccountsReceivableProductSales 40four_GrossAccountsReceivableProductSales
Gross accounts receivable, Licensing revenue $ 148four_GrossAccountsReceivableLicensingRevenue $ 276four_GrossAccountsReceivableLicensingRevenue