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Notes Payable - Components of Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Components of notes payable    
Total notes payable $ 4,000us-gaap_NotesPayable $ 500us-gaap_NotesPayable
Non-current notes payable 3,778us-gaap_LongTermNotesPayable 500us-gaap_LongTermNotesPayable
Revolving Credit Facility    
Components of notes payable    
Total notes payable $ 4,000us-gaap_NotesPayable
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
$ 500us-gaap_NotesPayable
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember