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Certain Balance Sheet Accounts - Summary of Allowance for Doubtful Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Financial Position [Abstract]      
Balance, beginning of year $ 254us-gaap_AllowanceForDoubtfulAccountsReceivable $ 404us-gaap_AllowanceForDoubtfulAccountsReceivable $ 326us-gaap_AllowanceForDoubtfulAccountsReceivable
Provision for doubtful accounts 320us-gaap_ProvisionForDoubtfulAccounts 189us-gaap_ProvisionForDoubtfulAccounts 708us-gaap_ProvisionForDoubtfulAccounts
Write-offs (386)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (339)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (630)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance, end of year $ 188us-gaap_AllowanceForDoubtfulAccountsReceivable $ 254us-gaap_AllowanceForDoubtfulAccountsReceivable $ 404us-gaap_AllowanceForDoubtfulAccountsReceivable