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Accounts Receivable - Additional Information (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Unbilled receivables $ 963,000us-gaap_UnbilledReceivablesCurrent $ 1,503,000us-gaap_UnbilledReceivablesCurrent
Accounts receivable allowances accrued $ 0us-gaap_AllowanceForDoubtfulAccountsReceivable $ 0us-gaap_AllowanceForDoubtfulAccountsReceivable