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DEBT AND EQUITY FINANCINGS, Warrants By Exercise Price Range (Details) (USD $)
0 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Jan. 30, 2015
Mar. 04, 2015
Warrants [Member]          
Shares Authorized under Warrants, Exercise Price Range [Line Items]          
Exercise prices (in dollars per share) $ 0.80us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
$ 0.80us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
$ 0.98us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
   
Number of shares (in shares) 5,338,459us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
5,338,459us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
1,683,673us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
   
Remaining life 9 years 4 months 10 days        
Warrants [Member] | Exercise Price Range One [Member]          
Shares Authorized under Warrants, Exercise Price Range [Line Items]          
Exercise prices (in dollars per share) $ 0.98us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeOneMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
$ 0.98us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeOneMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Number of shares (in shares) 1,683,673us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeOneMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
1,683,673us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeOneMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Remaining life   9 years      
Warrants [Member] | Exercise Price Range Two [Member]          
Shares Authorized under Warrants, Exercise Price Range [Line Items]          
Exercise prices (in dollars per share) $ 0.72us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeTwoMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
$ 0.72us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeTwoMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Number of shares (in shares) 1,538,462us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeTwoMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
1,538,462us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeTwoMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Remaining life   9 years 9 months 29 days      
Warrants [Member] | Exercise Price Range Three [Member]          
Shares Authorized under Warrants, Exercise Price Range [Line Items]          
Exercise prices (in dollars per share) $ 0.65us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeThreeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
$ 0.65us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeThreeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Number of shares (in shares) 854,789us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeThreeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
854,789us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeThreeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Remaining life   9 years      
Warrants [Member] | Exercise Price Range Four [Member]          
Shares Authorized under Warrants, Exercise Price Range [Line Items]          
Exercise prices (in dollars per share) $ 0.82us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeFourMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
$ 0.82us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeFourMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Number of shares (in shares) 684,934us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeFourMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
684,934us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeFourMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Remaining life   9 years 11 months 1 day      
Warrants [Member] | Exercise Price Range Five [Member]          
Shares Authorized under Warrants, Exercise Price Range [Line Items]          
Exercise prices (in dollars per share) $ 0.73us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeFiveMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
$ 0.73us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeFiveMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Number of shares (in shares) 576,600us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeFiveMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
576,600us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeFiveMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Remaining life   9 years      
Warrants [Member] | Exercise Price Range Six [Member]          
Shares Authorized under Warrants, Exercise Price Range [Line Items]          
Number of shares (in shares) 5,338,458us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeSixMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
5,338,458us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= four_ExercisePriceRangeSixMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
     
Initial Warrants [Member]          
Shares Authorized under Warrants, Exercise Price Range [Line Items]          
Exercise prices (in dollars per share) $ 0.72us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= four_InitialWarrantsMember
$ 0.72us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= four_InitialWarrantsMember
  $ 0.72us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= four_InitialWarrantsMember
 
March 2015 Warrant [Member]          
Shares Authorized under Warrants, Exercise Price Range [Line Items]          
Exercise prices (in dollars per share) $ 0.82us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= four_March2015WarrantMember
$ 0.82us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= four_March2015WarrantMember
    $ 0.82us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= four_March2015WarrantMember