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Balance Sheet Detail (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Jan. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Inventories:        
Work in process $ 80us-gaap_InventoryWorkInProcessNetOfReserves $ 61us-gaap_InventoryWorkInProcessNetOfReserves $ 135us-gaap_InventoryWorkInProcessNetOfReserves  
Finished goods 11us-gaap_InventoryFinishedGoodsNetOfReserves 63us-gaap_InventoryFinishedGoodsNetOfReserves 2us-gaap_InventoryFinishedGoodsNetOfReserves  
Channel inventory 124bpmx_InventoryChannelNetOfReserves 36bpmx_InventoryChannelNetOfReserves 1bpmx_InventoryChannelNetOfReserves  
Total 215us-gaap_InventoryNet 160us-gaap_InventoryNet 138us-gaap_InventoryNet  
Prepaid expenses and other current assets:        
Deferred offering costs 490us-gaap_DeferredOfferingCosts 57us-gaap_DeferredOfferingCosts    
Other 182us-gaap_OtherPrepaidExpenseCurrent 182us-gaap_OtherPrepaidExpenseCurrent    
Total 672us-gaap_PrepaidExpenseAndOtherAssetsCurrent 239us-gaap_PrepaidExpenseAndOtherAssetsCurrent 269us-gaap_PrepaidExpenseAndOtherAssetsCurrent 36us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Accrued expenses and other current liabilities:        
Professional service fees 209us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent      
Marketing 72us-gaap_AccruedMarketingCostsCurrent   267us-gaap_AccruedMarketingCostsCurrent  
Deferred revenue 51us-gaap_DeferredRevenue 6us-gaap_DeferredRevenue    
Deferred rent 43us-gaap_AccruedRentCurrentAndNoncurrent 49us-gaap_AccruedRentCurrentAndNoncurrent    
Other 42us-gaap_OtherAccruedLiabilitiesCurrent 4us-gaap_OtherAccruedLiabilitiesCurrent 22us-gaap_OtherAccruedLiabilitiesCurrent 19us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued liabilities $ 417us-gaap_AccruedLiabilitiesAndOtherLiabilities $ 59us-gaap_AccruedLiabilitiesAndOtherLiabilities