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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets    
Cash and cash equivalents $ 74,548us-gaap_CashAndCashEquivalentsAtCarryingValue $ 30,753us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 67us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 825us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 42,753us-gaap_AccountsReceivableNetCurrent 42,794us-gaap_AccountsReceivableNetCurrent
Inventories, net 109,525us-gaap_InventoryNet 104,063us-gaap_InventoryNet
Prepaid expenses and other current assets 7,493us-gaap_PrepaidExpenseAndOtherAssetsCurrent 6,700us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 234,386us-gaap_AssetsCurrent 185,135us-gaap_AssetsCurrent
Property, plant and equipment, net 30,198us-gaap_PropertyPlantAndEquipmentNet 30,464us-gaap_PropertyPlantAndEquipmentNet
Other assets 11,573us-gaap_OtherAssetsNoncurrent 12,055us-gaap_OtherAssetsNoncurrent
Total assets 276,157us-gaap_Assets 227,654us-gaap_Assets
Current liabilities    
Accounts payable 30,536us-gaap_AccountsPayableCurrent 21,605us-gaap_AccountsPayableCurrent
Accrued compensation 5,611us-gaap_EmployeeRelatedLiabilitiesCurrent 4,232us-gaap_EmployeeRelatedLiabilitiesCurrent
Warranty 1,909us-gaap_ProductWarrantyAccrualClassifiedCurrent 1,352us-gaap_ProductWarrantyAccrualClassifiedCurrent
Income taxes 322us-gaap_AccruedIncomeTaxesCurrent 196us-gaap_AccruedIncomeTaxesCurrent
Deferred revenue 8,247us-gaap_DeferredRevenueCurrent 6,782us-gaap_DeferredRevenueCurrent
Current portion of long-term debt   14,530us-gaap_LongTermDebtCurrent
Other current liabilities 3,748us-gaap_OtherLiabilitiesCurrent 3,401us-gaap_OtherLiabilitiesCurrent
Total current liabilities 50,373us-gaap_LiabilitiesCurrent 52,098us-gaap_LiabilitiesCurrent
Sale leaseback obligation 47,586us-gaap_SaleLeasebackTransactionAmountDueUnderFinancingArrangement  
Long-term deferred revenue 409us-gaap_DeferredRevenueNoncurrent 449us-gaap_DeferredRevenueNoncurrent
Other long-term liabilities 6,520us-gaap_OtherLiabilitiesNoncurrent 6,755us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 104,888us-gaap_Liabilities 59,302us-gaap_Liabilities
Commitments and contingencies (Note 13)      
Stockholders' equity    
Preferred stock, $0.001 par value, 30,000 shares authorized; none issued or outstanding      
Common stock, $0.001 par value, 300,000 shares authorized; 113,633 shares issued and 113,513 shares outstanding at March 31, 2015; 112,849 shares issued and 112,729 shares outstanding at December 31, 2014 114us-gaap_CommonStockValueOutstanding 113us-gaap_CommonStockValueOutstanding
Additional paid-in capital 521,107us-gaap_AdditionalPaidInCapital 519,068us-gaap_AdditionalPaidInCapital
Treasury stock, at cost, 120 shares at March 31, 2015 and December 31, 2014 (1,218)us-gaap_TreasuryStockValue (1,218)us-gaap_TreasuryStockValue
Accumulated deficit (349,019)us-gaap_RetainedEarningsAccumulatedDeficit (350,887)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income 285us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 1,276us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 171,269us-gaap_StockholdersEquity 168,352us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 276,157us-gaap_LiabilitiesAndStockholdersEquity $ 227,654us-gaap_LiabilitiesAndStockholdersEquity