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SUBSEQUENT EVENT NOTE (Details) (Subsequent event, Underwriters Overallotment Option Exercise, USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended
Apr. 22, 2015
Subsequent event | Underwriters Overallotment Option Exercise
 
Subsequent events  
Common stock issued (in shares) 165,452us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TransactionTypeAxis
= stdy_UnderwritersOverallotmentOptionExerciseMember
Net proceeds from the issuance of common stock $ 1,308us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TransactionTypeAxis
= stdy_UnderwritersOverallotmentOptionExerciseMember