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Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current    
Accrued liabilities $ 1,438spnc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesCurrent $ 916spnc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesCurrent
Deferred revenue 544us-gaap_DeferredTaxAssetsDeferredIncome 541us-gaap_DeferredTaxAssetsDeferredIncome
Inventories 1,938us-gaap_DeferredTaxAssetsInventory 638us-gaap_DeferredTaxAssetsInventory
Total deferred tax assets, current portion, gross 3,920us-gaap_DeferredTaxAssetsGrossCurrent 2,095us-gaap_DeferredTaxAssetsGrossCurrent
Less valuation allowance (1,720)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (1,650)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Total deferred tax assets, current portion, net 2,200us-gaap_DeferredTaxAssetsNetCurrent 445us-gaap_DeferredTaxAssetsNetCurrent
Noncurrent    
Net operating loss carryforwards-U.S. and related states 55,002us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 7,801us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Charitable contribution carryover 212us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards 47us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards
Capital loss carryover 403us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 412us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Amortization of intangibles 1,031us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 1,224us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Stock compensation expense related to nonqualified stock options 2,434us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,377us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Research and experimentation tax credit 4,689us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 966us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Alternative minimum tax credit 298us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 298us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Accrued liabilities, not deducted until paid for tax purposes 457spnc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesNoncurrent 535spnc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesNoncurrent
Deferred tax assets, noncurrent portion, gross 64,526us-gaap_DeferredTaxAssetsGrossNoncurrent 12,660us-gaap_DeferredTaxAssetsGrossNoncurrent
Less valuation allowance (28,095)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (10,144)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Deferred tax assets, noncurrent portion, net 36,431us-gaap_DeferredTaxAssetsNetNoncurrent 2,516us-gaap_DeferredTaxAssetsNetNoncurrent
Noncurrent    
Equipment (2,192)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (2,663)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Long-lived intangible assets (37,916)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (1,218)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total deferred tax liabilities, noncurrent portion, net $ (3,677)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (1,365)us-gaap_DeferredTaxLiabilitiesNoncurrent