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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Current assets:    
Cash and cash equivalents $ 20,490us-gaap_CashAndCashEquivalentsAtCarryingValue $ 43,114us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 9,879us-gaap_AccountsReceivableNetCurrent 7,556us-gaap_AccountsReceivableNetCurrent
Inventory 20,596us-gaap_InventoryNet 20,694us-gaap_InventoryNet
Prepaid expenses and other current assets 10,764us-gaap_PrepaidExpenseAndOtherAssetsCurrent 9,004us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Restricted cash 2,822us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 2,913us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Total current assets 64,551us-gaap_AssetsCurrent 83,281us-gaap_AssetsCurrent
Property, plant and equipment, net 56,097us-gaap_PropertyPlantAndEquipmentNet 64,574us-gaap_PropertyPlantAndEquipmentNet
Intangibles, net 1,422us-gaap_IntangibleAssetsNetExcludingGoodwill 1,995us-gaap_IntangibleAssetsNetExcludingGoodwill
Restricted cash 1,236us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 3,394us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Deferred tax assets 7,766us-gaap_DeferredTaxAssetsNetNoncurrent 7,724us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets 2,753us-gaap_OtherAssetsNoncurrent 7,541us-gaap_OtherAssetsNoncurrent
Total assets 133,825us-gaap_Assets 168,509us-gaap_Assets
Current liabilities:    
Accounts payable and accrued expenses 21,615us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 21,764us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Note payable, current portion, net of discount of $244 as of March 31, 2015 and $555 as of March 31, 2014 3,756us-gaap_NotesPayableCurrent 6,240us-gaap_NotesPayableCurrent
Derivative liabilities 2,999us-gaap_DerivativeLiabilitiesCurrent 2,601us-gaap_DerivativeLiabilitiesCurrent
Deferred revenue 11,019us-gaap_DeferredRevenueCurrent 9,456us-gaap_DeferredRevenueCurrent
Deferred tax liabilities 7,843us-gaap_DeferredTaxLiabilitiesGrossCurrent 7,761us-gaap_DeferredTaxLiabilitiesGrossCurrent
Total current liabilities 47,232us-gaap_LiabilitiesCurrent 47,822us-gaap_LiabilitiesCurrent
Note payable, net of discount of $290 as of March 31, 2015 and $287 as of March 31, 2014 3,877us-gaap_LongTermNotesPayable 6,380us-gaap_LongTermNotesPayable
Deferred revenue 2,756us-gaap_DeferredRevenueNoncurrent 990us-gaap_DeferredRevenueNoncurrent
Other liabilities 67us-gaap_OtherLiabilitiesNoncurrent 1,058us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 53,932us-gaap_Liabilities 56,250us-gaap_Liabilities
Commitments and contingencies (Note 13)      
Stockholders' equity:    
Common stock, $0.01 par value, 75,000,000 and 150,000,000 shares authorized; 9,624,275 and 7,892,990 shares issued at March 31, 2015 and 2014, respectively 96us-gaap_CommonStockValue 79us-gaap_CommonStockValue
Additional paid-in capital 985,921us-gaap_AdditionalPaidInCapitalCommonStock 967,100us-gaap_AdditionalPaidInCapitalCommonStock
Treasury stock, at cost, 34,067 and 5,705 shares at March 31, 2015 and 2014, respectively (771)us-gaap_TreasuryStockValue (370)us-gaap_TreasuryStockValue
Accumulated other comprehensive (loss) income (308)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 1,839us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (905,045)us-gaap_RetainedEarningsAccumulatedDeficit (856,389)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 79,893us-gaap_StockholdersEquity 112,259us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 133,825us-gaap_LiabilitiesAndStockholdersEquity $ 168,509us-gaap_LiabilitiesAndStockholdersEquity