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COMMITMENTS AND CONTINGENT LIABILITIES (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 24 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2006
OCS        
Royalties        
Royalties to be paid as percentage of amount received, maximum at base (as a percent) 100.00%stdy_RoyaltiesToBePaidAsPercentageOfAmountReceivedMaximumAtBase
/ us-gaap_CounterpartyNameAxis
= stdy_OfficeOfChiefScientistMember
     
Royalties to be paid as percentage of amount received, maximum if transfer manufacturing out of Israel (as a percent) 300.00%stdy_RoyaltiesToBePaidAsPercentageOfAmountReceivedMaximumIfTransferManufacturingOutOfIsrael
/ us-gaap_CounterpartyNameAxis
= stdy_OfficeOfChiefScientistMember
     
Royalties to be paid as percentage of amount received, maximum if transfer Intellectual Property Rights (as a percent) 600.00%stdy_RoyaltiesToBePaidAsPercentageOfAmountReceivedMaximumIfTransferIntellectualPropertyRights
/ us-gaap_CounterpartyNameAxis
= stdy_OfficeOfChiefScientistMember
     
Additional obligations incurred per grant terms   $ 0stdy_AdditionalObligationsIncurredPerGrantTerms
/ us-gaap_CounterpartyNameAxis
= stdy_OfficeOfChiefScientistMember
$ 0stdy_AdditionalObligationsIncurredPerGrantTerms
/ us-gaap_CounterpartyNameAxis
= stdy_OfficeOfChiefScientistMember
 
Aggregate contingent obligation per grant terms   367stdy_AggregateContingentObligationPerGrantTerms
/ us-gaap_CounterpartyNameAxis
= stdy_OfficeOfChiefScientistMember
   
RAD BioMed Ltd        
Royalties        
Royalties to be paid as percentage of amount received, maximum if transfer manufacturing out of Israel (as a percent) 300.00%stdy_RoyaltiesToBePaidAsPercentageOfAmountReceivedMaximumIfTransferManufacturingOutOfIsrael
/ us-gaap_CounterpartyNameAxis
= stdy_RadBiomedLtdMember
     
Royalties to be paid as percentage of amount received, maximum if transfer Intellectual Property Rights (as a percent) 600.00%stdy_RoyaltiesToBePaidAsPercentageOfAmountReceivedMaximumIfTransferIntellectualPropertyRights
/ us-gaap_CounterpartyNameAxis
= stdy_RadBiomedLtdMember
     
Grants received       $ 280us-gaap_ProceedsFromGrantors
/ us-gaap_CounterpartyNameAxis
= stdy_RadBiomedLtdMember
Minimum | OCS        
Royalties        
Royalties commitment on future revenues (as a percent) 3.00%stdy_PercentageOfRoyaltyCommitmentsOnFutureRevenues
/ us-gaap_CounterpartyNameAxis
= stdy_OfficeOfChiefScientistMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Maximum | OCS        
Royalties        
Royalties commitment on future revenues (as a percent) 5.00%stdy_PercentageOfRoyaltyCommitmentsOnFutureRevenues
/ us-gaap_CounterpartyNameAxis
= stdy_OfficeOfChiefScientistMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember