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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Current assets:    
Cash and cash equivalents $ 35,983us-gaap_CashAndCashEquivalentsAtCarryingValue $ 43,114us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 10,778us-gaap_AccountsReceivableNetCurrent 7,556us-gaap_AccountsReceivableNetCurrent
Inventory 26,536us-gaap_InventoryNet 20,694us-gaap_InventoryNet
Prepaid expenses and other current assets 11,705us-gaap_PrepaidExpenseAndOtherAssetsCurrent 9,004us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Restricted cash 1,508us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 2,913us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Total current assets 86,510us-gaap_AssetsCurrent 83,281us-gaap_AssetsCurrent
Property, plant and equipment, net 58,257us-gaap_PropertyPlantAndEquipmentNet 64,574us-gaap_PropertyPlantAndEquipmentNet
Intangibles, net 1,565us-gaap_IntangibleAssetsNetExcludingGoodwill 1,995us-gaap_IntangibleAssetsNetExcludingGoodwill
Restricted cash 100us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 3,394us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Deferred tax assets 7,724us-gaap_DeferredTaxAssetsNetNoncurrent 7,724us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets 2,833us-gaap_OtherAssetsNoncurrent 7,541us-gaap_OtherAssetsNoncurrent
Total assets 156,989us-gaap_Assets 168,509us-gaap_Assets
Current liabilities:    
Accounts payable and accrued expenses 24,805us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 21,764us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Accrued arbitration liability 10,323us-gaap_LitigationReserve  
Note payable, current portion, net of discount of $306 as of December 31, 2014 and $555 as of March 31, 2014 3,694us-gaap_NotesPayableCurrent 6,240us-gaap_NotesPayableCurrent
Derivative liabilities 3,914us-gaap_DerivativeLiabilitiesCurrent 2,601us-gaap_DerivativeLiabilitiesCurrent
Deferred revenue 15,385us-gaap_DeferredRevenueCurrent 9,456us-gaap_DeferredRevenueCurrent
Deferred tax liabilities 7,724us-gaap_DeferredTaxLiabilitiesGrossCurrent 7,761us-gaap_DeferredTaxLiabilitiesGrossCurrent
Total current liabilities 65,845us-gaap_LiabilitiesCurrent 47,822us-gaap_LiabilitiesCurrent
Note payable, net of discount of $298 as of December 31, 2014 and $287 as of March 31, 2014 4,868us-gaap_LongTermNotesPayable 6,380us-gaap_LongTermNotesPayable
Deferred revenue 2,906us-gaap_DeferredRevenueNoncurrent 990us-gaap_DeferredRevenueNoncurrent
Other liabilities 895us-gaap_OtherLiabilitiesNoncurrent 1,058us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 74,514us-gaap_Liabilities 56,250us-gaap_Liabilities
Commitments and contingencies (Note 13)      
Stockholders' equity:    
Common stock 961us-gaap_CommonStockValue 789us-gaap_CommonStockValue
Additional paid-in capital 983,406us-gaap_AdditionalPaidInCapitalCommonStock 966,390us-gaap_AdditionalPaidInCapitalCommonStock
Treasury stock (771)us-gaap_TreasuryStockValue (370)us-gaap_TreasuryStockValue
Accumulated other comprehensive income 560us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 1,839us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (901,681)us-gaap_RetainedEarningsAccumulatedDeficit (856,389)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 82,475us-gaap_StockholdersEquity 112,259us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 156,989us-gaap_LiabilitiesAndStockholdersEquity $ 168,509us-gaap_LiabilitiesAndStockholdersEquity