Annual report pursuant to Section 13 and 15(d)

Allowance for Bad Debts (Detail)

v2.4.1.9
Allowance for Bad Debts (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for doubtful accounts $ 210us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 57us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 53us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Additions 350us-gaap_ProvisionForDoubtfulAccounts 170us-gaap_ProvisionForDoubtfulAccounts 17us-gaap_ProvisionForDoubtfulAccounts
Write-offs (452)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (17)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (13)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Allowance for doubtful accounts $ 108us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 210us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 57us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent