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Receivables, Net - Rollforward of Allowance for Doubtful Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for doubtful accounts      
Beginning balance $ 22us-gaap_AllowanceForDoubtfulAccountsReceivable $ 15us-gaap_AllowanceForDoubtfulAccountsReceivable $ 6us-gaap_AllowanceForDoubtfulAccountsReceivable
Net charge-offs (7)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (2)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (5)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Provision 4us-gaap_ProvisionForDoubtfulAccounts 9us-gaap_ProvisionForDoubtfulAccounts 14us-gaap_ProvisionForDoubtfulAccounts
Ending balance $ 19us-gaap_AllowanceForDoubtfulAccountsReceivable $ 22us-gaap_AllowanceForDoubtfulAccountsReceivable $ 15us-gaap_AllowanceForDoubtfulAccountsReceivable