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WARRANTS TO PURCHASE CONVERTIBLE PREFERRED SHARES (Details)
0 Months Ended 3 Months Ended
Mar. 25, 2015
Mar. 19, 2015
Mar. 31, 2015
Dec. 31, 2014
Warrants Disclosures        
Warrants outstanding (in shares)   10,191us-gaap_ClassOfWarrantOrRightOutstanding   711,120us-gaap_ClassOfWarrantOrRightOutstanding
Number of warrants voluntarily exercised (in shares)     700,929stdy_NumberOfWarrantsVoluntarilyExercised  
Conversion of warrants to purchase Convertible Preferred Shares into Ordinary Shares (in shares)     697,443stdy_StockIssuedDuringPeriodWarrantsExercised  
Number of Warrants for Convertible Preferred Shares exercised on cashless basis (in shares)   405,232stdy_WarrantsForConvertiblePreferredSharesExercisedOnCashlessBasis    
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