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GENERAL (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 0 Months Ended
Mar. 25, 2015
Mar. 19, 2015
Mar. 31, 2015
Mar. 25, 2015
Dec. 31, 2014
Initial Public Offering          
Aggregate net proceeds received from IPO offering, net of underwriting discounts and commissions and offering expenses     $ 34,787us-gaap_StockIssuedDuringPeriodValueNewIssues    
Warrants Disclosures          
Warrants outstanding (in shares)   10,191us-gaap_ClassOfWarrantOrRightOutstanding     711,120us-gaap_ClassOfWarrantOrRightOutstanding
Number of Warrants for Convertible Preferred Shares exercised for cash (in shares)   295,697stdy_WarrantsForConvertiblePreferredSharesExercisedForCas      
Number of Warrants for Convertible Preferred Shares exercised on cashless basis (in shares)   405,232stdy_WarrantsForConvertiblePreferredSharesExercisedOnCashlessBasis      
Net number of Warrants for Convertible Preferred Shares exercised (in shares)   401,746stdy_NetWarrantsForConvertiblePreferredSharesExercised      
Number of Warrants for Convertible Preferred Shares cancelled (in shares)   3,486stdy_WarrantsForConvertiblePreferredSharesCancelled 3,486stdy_WarrantsForConvertiblePreferredSharesCancelled    
Number of Warrants for Convertible Preferred Shares automatically converted into warrants for Ordinary Shares (in shares) 10,191stdy_WarrantsForConvertiblePreferredSharesAutomaticallyConvertedIntoWarrantsForOrdinaryShares   10,191stdy_WarrantsForConvertiblePreferredSharesAutomaticallyConvertedIntoWarrantsForOrdinaryShares    
IPO          
Initial Public Offering          
Common stock issued (in shares)       4,700,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Share Price (in dollars per share) 8.50us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
    $ 8.50us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Aggregate net proceeds received from IPO offering, net of underwriting discounts and commissions and offering expenses       $ 34,787us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Conversion of Convertible Preferred Shares into Ordinary Shares upon IPO (in shares) 7,464,320us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember