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Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Valuation Allowance [Line Items]    
Reserve $ 2,527us-gaap_ValuationAllowancesAndReservesBalance $ 610us-gaap_ValuationAllowancesAndReservesBalance
Accounts receivable    
Valuation Allowance [Line Items]    
Reserve   64us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsReceivableMember
Other Accrued Expense    
Valuation Allowance [Line Items]    
Reserve $ 2,527us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_BalanceSheetLocationAxis
= aria_OtherAccruedExpenseMember		 $ 546us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_BalanceSheetLocationAxis
= aria_OtherAccruedExpenseMember