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SHAREHOLDERS' EQUITY (DEFICIT) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 0 Months Ended
Mar. 01, 2015
Mar. 31, 2015
Jan. 24, 2015
SHAREHOLDERS' Equity (Deficit)      
Stock split ratio 7.75us-gaap_StockholdersEquityNoteStockSplitConversionRatio1    
Proceeds from Issuance of Convertible Preferred Stock   $ 11,406us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock  
Series E preferred stock      
SHAREHOLDERS' Equity (Deficit)      
Proceeds from Issuance of Convertible Preferred Stock     $ 11,406us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Convertible Preferred Stock issued (in shares)     1,445,966stdy_ConvertiblePreferredStockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Share Price (in dollars per share)     $ 8.49us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember