Components of Net Deferred Income Tax Asset and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Net deferred income tax asset-Current
Net deferred income tax asset-Current	$ 5,936us-gaap_DeferredTaxAssetsNetCurrent	$ 4,601us-gaap_DeferredTaxAssetsNetCurrent
Net deferred income tax asset-Non-current
Deferred income tax asset - Non-current	8,443	11,268
Valuation Allowance	(1,819)	(6,845)
Net deferred income tax asset-Non-current	6,624us-gaap_DeferredTaxAssetsNetNoncurrent	4,423us-gaap_DeferredTaxAssetsNetNoncurrent
Net deferred income tax liability-Non-current
Deferred tax liability, net		1,171
Warranty Cost
Net deferred income tax asset-Current
Net deferred income tax asset-Current	404	348
Bad Debt Reserve
Net deferred income tax asset-Current
Net deferred income tax asset-Current	30	73
Inventory Reserve
Net deferred income tax asset-Current
Net deferred income tax asset-Current	512	253
Unearned Service Revenue
Net deferred income tax asset-Current
Net deferred income tax asset-Current	3,474	2,992
Net deferred income tax asset-Non-current
Deferred income tax asset - Non-current	1,649	1,654
Other
Net deferred income tax asset-Current
Net deferred income tax asset-Current	1,516	935
Depreciation
Net deferred income tax asset-Non-current
Deferred income tax asset - Non-current	(3,059)	(1,559)
Goodwill Amortization
Net deferred income tax asset-Non-current
Deferred income tax asset - Non-current	(2,007)	(1,841)
Product Design Costs
Net deferred income tax asset-Non-current
Deferred income tax asset - Non-current	(136)	(259)
Employee Stock Option
Net deferred income tax asset-Non-current
Deferred income tax asset - Non-current	2,756	3,021
Intangible Assets
Net deferred income tax liability-Non-current
Deferred tax liability, net		(1,171)
Loss Carryforwards
Net deferred income tax asset-Non-current
Deferred income tax asset - Non-current	$ 9,240	$ 10,252

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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