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STOCK-BASED COMPENSATION Employee Stock Purchase Plan (Details) (Employee Stock, USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended
May 07, 2013
Dec. 31, 2014
Employee Stock
   
Equity Incentive Plans    
Purchase price of Common Stock (as a percent) 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
 
Number of shares authorized (in shares)   750,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Grants since inception of plan (in shares)   0bios_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrants
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Compensation expense   $ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember