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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred revenue and costs    
Deferred equipment revenue $ 883woof_DeferredEquipmentRevenue $ 811woof_DeferredEquipmentRevenue
Deferred fixed-priced support or maintenance contract revenue 4,265woof_DeferredFixedPricedSupportOrMaintenanceContractRevenue 3,854woof_DeferredFixedPricedSupportOrMaintenanceContractRevenue
Other deferred revenue 9,190woof_OtherDeferredRevenue 6,578woof_OtherDeferredRevenue
Total deferred revenue 14,338us-gaap_DeferredRevenue 11,243us-gaap_DeferredRevenue
Less current portion included in other accrued liabilities 14,304us-gaap_DeferredRevenueCurrent 11,190us-gaap_DeferredRevenueCurrent
Long-term portion of deferred revenue included in other liabilities 34us-gaap_DeferredRevenueNoncurrent 53us-gaap_DeferredRevenueNoncurrent
Current portion of deferred costs included in prepaid expenses and other 866us-gaap_DeferredCostsCurrent 502us-gaap_DeferredCostsCurrent
Long-term portion of deferred costs included in other assets 1,126us-gaap_DeferredCosts 698us-gaap_DeferredCosts
Total deferred costs $ 1,992us-gaap_DeferredCostsCurrentAndNoncurrent $ 1,200us-gaap_DeferredCostsCurrentAndNoncurrent