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Summary of Significant Accounting Policies - Changes in Allowance for Doubtful Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Balances at beginning of period $ 417us-gaap_AllowanceForDoubtfulAccountsReceivable $ 277us-gaap_AllowanceForDoubtfulAccountsReceivable $ 196us-gaap_AllowanceForDoubtfulAccountsReceivable
Additions 821us-gaap_ProvisionForDoubtfulAccounts 359us-gaap_ProvisionForDoubtfulAccounts 296us-gaap_ProvisionForDoubtfulAccounts
Write-offs (249)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (219)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (215)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balances at end of period $ 989us-gaap_AllowanceForDoubtfulAccountsReceivable $ 417us-gaap_AllowanceForDoubtfulAccountsReceivable $ 277us-gaap_AllowanceForDoubtfulAccountsReceivable