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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
OPERATING ACTIVITIES    
Net loss $ (64,965)us-gaap_NetIncomeLoss $ (8,949)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,041us-gaap_DepreciationAndAmortization  
Stock-based compensation 5,415us-gaap_ShareBasedCompensation 383us-gaap_ShareBasedCompensation
Loss from remeasurement of fair value of convertible preferred stock options   629juno_ConvertiblePreferredStockOptionRemeasurementGainLoss
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (1,650)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (345)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (27)us-gaap_IncreaseDecreaseInAccountsPayable 332us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities and other long-term liabilities (373)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities (1,816)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Success payment liabilities 38,910juno_IncreaseDecreaseInSuccessPaymentLiabilities 177juno_IncreaseDecreaseInSuccessPaymentLiabilities
Net cash used in operating activities (21,649)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (9,589)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
INVESTING ACTIVITIES    
Purchases of marketable securities (181,313)us-gaap_PaymentsToAcquireAvailableForSaleSecurities  
Sales and maturities of marketable securities 15,201us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities  
Purchase of cost-method investment   (3,455)us-gaap_PaymentsToAcquireOtherInvestments
Purchase of property and equipment (2,342)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (221)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (168,454)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (3,676)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
FINANCING ACTIVITIES    
Payment of issuance costs related to issuance of common stock (1,683)us-gaap_PaymentsOfStockIssuanceCosts  
Payments of build-to-suit lease obligation (24)juno_PaymentsOfBuildToSuitLeaseObligation  
Net cash used in financing activities (1,707)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations  
Net decrease in cash and cash equivalents (191,810)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (13,265)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 355,968us-gaap_CashAndCashEquivalentsAtCarryingValue 35,966us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 164,158us-gaap_CashAndCashEquivalentsAtCarryingValue 22,701us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL CASH FLOW INFORMATION    
Purchases of property and equipment included in accounts payable and accrued liabilities 610us-gaap_CapitalExpendituresIncurredButNotYetPaid  
Amounts capitalized under build-to-suit leases $ 9,910juno_AmountsCapitalizedUnderBuildToSuitTransactions