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Discontinued Operations - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2009
Discontinued Operations and Disposal Groups [Abstract]        
Gain from discontinued operations, net of tax $ 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax $ 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax $ 153,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax $ 187,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Negotiated consideration for 3D product line sales       2,700,000us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Negotiated consideration for the sales of discontinued operation in the form of cash       320,000us-gaap_ProceedsFromDivestitureOfBusinesses
Negotiated consideration for the sales of discontinued operation in the form of notes receivable       2,400,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet
Carrying value of intangible assets sold       $ 0us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets