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WARRANTS TO PURCHASE CONVERTIBLE PREFERRED SHARES (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Warrants to purchase convertible preferred shares  
Balance, beginning $ 6,072us-gaap_WarrantsAndRightsOutstanding
Revaluation of fair value of warrants to purchase Convertible Preferred Shares (40)stdy_IncreaseDecreaseInFairValueOfWarrants
Classification to Equity upon conversion of warrants (5,945)us-gaap_ConversionOfStockAmountConverted1
Classification to Equity upon automatic conversion into warrants to purchase Ordinary Shares $ (87)stdy_ConversionOfWarrantsToPurchaseConvertiblePreferredSharesIntoWarrantsToPurchaseOrdinaryShares