3.7.0.1 html 309 440 1 false 90 0 false 11 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.oesx.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 1001000 - Statement - Consolidated Balance Sheets Sheet http://www.oesx.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.oesx.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1002000 - Statement - Consolidated Statements of Operations and Comprehensive Income Sheet http://www.oesx.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncome Consolidated Statements of Operations and Comprehensive Income Statements 4 false false R5.htm 1003000 - Statement - Statements of Shareholders' Equity Sheet http://www.oesx.com/role/StatementsOfShareholdersEquity Statements of Shareholders' Equity Statements 5 false false R6.htm 1004000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.oesx.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 6 false false R7.htm 2101100 - Disclosure - Description of Business Sheet http://www.oesx.com/role/DescriptionOfBusiness Description of Business Notes 7 false false R8.htm 2102100 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.oesx.com/role/SummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 8 false false R9.htm 2103100 - Disclosure - Accounts Receivable Sheet http://www.oesx.com/role/AccountsReceivable Accounts Receivable Notes 9 false false R10.htm 2104100 - Disclosure - Financing Receivables Sheet http://www.oesx.com/role/FinancingReceivables Financing Receivables Notes 10 false false R11.htm 2105100 - Disclosure - Inventories Sheet http://www.oesx.com/role/Inventories Inventories Notes 11 false false R12.htm 2106100 - Disclosure - Prepaid Expenses and Other Current Assets Sheet http://www.oesx.com/role/PrepaidExpensesAndOtherCurrentAssets Prepaid Expenses and Other Current Assets Notes 12 false false R13.htm 2107100 - Disclosure - Property and Equipment Sheet http://www.oesx.com/role/PropertyAndEquipment Property and Equipment Notes 13 false false R14.htm 2108100 - Disclosure - Goodwill and Other Intangible Assets Sheet http://www.oesx.com/role/GoodwillAndOtherIntangibleAssets Goodwill and Other Intangible Assets Notes 14 false false R15.htm 2109100 - Disclosure - Other Long-Term Assets Sheet http://www.oesx.com/role/OtherLongTermAssets Other Long-Term Assets Notes 15 false false R16.htm 2110100 - Disclosure - Accrued Expenses and Other Sheet http://www.oesx.com/role/AccruedExpensesAndOther Accrued Expenses and Other Notes 16 false false R17.htm 2111100 - Disclosure - Net Income (Loss) per Common Share Sheet http://www.oesx.com/role/NetIncomeLossPerCommonShare Net Income (Loss) per Common Share Notes 17 false false R18.htm 2112100 - Disclosure - Acquisition Sheet http://www.oesx.com/role/Acquisition Acquisition Notes 18 false false R19.htm 2113100 - Disclosure - Related Party Transactions Sheet http://www.oesx.com/role/RelatedPartyTransactions Related Party Transactions Notes 19 false false R20.htm 2114100 - Disclosure - Long-Term Debt Sheet http://www.oesx.com/role/LongTermDebt Long-Term Debt Notes 20 false false R21.htm 2115100 - Disclosure - Income Taxes Sheet http://www.oesx.com/role/IncomeTaxes Income Taxes Notes 21 false false R22.htm 2116100 - Disclosure - Commitments and Contingencies Sheet http://www.oesx.com/role/CommitmentsAndContingencies Commitments and Contingencies Notes 22 false false R23.htm 2117100 - Disclosure - Shareholders' Equity Sheet http://www.oesx.com/role/ShareholdersEquity Shareholders' Equity Notes 23 false false R24.htm 2118100 - Disclosure - Stock Options, Restricted Shares and Warrants Sheet http://www.oesx.com/role/StockOptionsRestrictedSharesAndWarrants Stock Options, Restricted Shares and Warrants Notes 24 false false R25.htm 2119100 - Disclosure - Segment Data Sheet http://www.oesx.com/role/SegmentData Segment Data Notes 25 false false R26.htm 2120100 - Disclosure - Subsequent Events Sheet http://www.oesx.com/role/SubsequentEvents Subsequent Events Notes 26 false false R27.htm 2121100 - Disclosure - Quarterly Financial Data (Unaudited) Sheet http://www.oesx.com/role/QuarterlyFinancialDataUnaudited Quarterly Financial Data (Unaudited) Notes 27 false false R28.htm 2122100 - Schedule - Schedule II Valuation and Qualifying Accounts Sheet http://www.oesx.com/role/ScheduleIiValuationAndQualifyingAccounts Schedule II Valuation and Qualifying Accounts Uncategorized 28 false false R29.htm 2202201 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.oesx.com/role/SummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Uncategorized 29 false false R30.htm 2303301 - Disclosure - Accounts Receivable (Tables) Sheet http://www.oesx.com/role/AccountsReceivableTables Accounts Receivable (Tables) Uncategorized 30 false false R31.htm 2304301 - Disclosure - Financing Receivables (Tables) Sheet http://www.oesx.com/role/FinancingReceivablesTables Financing Receivables (Tables) Uncategorized 31 false false R32.htm 2305301 - Disclosure - Inventories (Tables) Sheet http://www.oesx.com/role/InventoriesTables Inventories (Tables) Uncategorized 32 false false R33.htm 2306301 - Disclosure - Prepaid Expenses and Other Current Assets (Tables) Sheet http://www.oesx.com/role/PrepaidExpensesAndOtherCurrentAssetsTables Prepaid Expenses and Other Current Assets (Tables) Uncategorized 33 false false R34.htm 2307301 - Disclosure - Property and Equipment (Tables) Sheet http://www.oesx.com/role/PropertyAndEquipmentTables Property and Equipment (Tables) Uncategorized 34 false false R35.htm 2308301 - Disclosure - Goodwill and Other Intangible Assets (Tables) Sheet http://www.oesx.com/role/GoodwillAndOtherIntangibleAssetsTables Goodwill and Other Intangible Assets (Tables) Uncategorized 35 false false R36.htm 2309301 - Disclosure - Other Long-Term Assets (Tables) Sheet http://www.oesx.com/role/OtherLongTermAssetsTables Other Long-Term Assets (Tables) Uncategorized 36 false false R37.htm 2310301 - Disclosure - Accrued Expenses and Other (Tables) Sheet http://www.oesx.com/role/AccruedExpensesAndOtherTables Accrued Expenses and Other (Tables) Uncategorized 37 false false R38.htm 2311301 - Disclosure - Net Income (Loss) per Common Share (Tables) Sheet http://www.oesx.com/role/NetIncomeLossPerCommonShareTables Net Income (Loss) per Common Share (Tables) Uncategorized 38 false false R39.htm 2314301 - Disclosure - Long-Term Debt (Tables) Sheet http://www.oesx.com/role/LongTermDebtTables Long-Term Debt (Tables) Uncategorized 39 false false R40.htm 2315301 - Disclosure - Income Taxes (Tables) Sheet http://www.oesx.com/role/IncomeTaxesTables Income Taxes (Tables) Uncategorized 40 false false R41.htm 2316301 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.oesx.com/role/CommitmentsAndContingenciesTables Commitments and Contingencies (Tables) Uncategorized 41 false false R42.htm 2317301 - Disclosure - Shareholders' Equity (Tables) Sheet http://www.oesx.com/role/ShareholdersEquityTables Shareholders' Equity (Tables) Uncategorized 42 false false R43.htm 2318301 - Disclosure - Stock Options, Restricted Shares and Warrants (Tables) Sheet http://www.oesx.com/role/StockOptionsRestrictedSharesAndWarrantsTables Stock Options, Restricted Shares and Warrants (Tables) Uncategorized 43 false false R44.htm 2319301 - Disclosure - Segment Data (Tables) Sheet http://www.oesx.com/role/SegmentDataTables Segment Data (Tables) Uncategorized 44 false false R45.htm 2321301 - Disclosure - Quarterly Financial Data (Unaudited) (Tables) Sheet http://www.oesx.com/role/QuarterlyFinancialDataUnauditedTables Quarterly Financial Data (Unaudited) (Tables) Uncategorized 45 false false R46.htm 2402402 - Disclosure - Summary of Significant Accounting Policies (Narrative) (Details) Sheet http://www.oesx.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails Summary of Significant Accounting Policies (Narrative) (Details) Uncategorized 46 false false R47.htm 2402403 - Disclosure - Summary of Significant Accounting Policies (Incentive Compensation) (Details) Sheet http://www.oesx.com/role/SummaryOfSignificantAccountingPoliciesIncentiveCompensationDetails Summary of Significant Accounting Policies (Incentive Compensation) (Details) Uncategorized 47 false false R48.htm 2402404 - Disclosure - Summary of Significant Accounting Policies (Concentration Risk) (Details) Sheet http://www.oesx.com/role/SummaryOfSignificantAccountingPoliciesConcentrationRiskDetails Summary of Significant Accounting Policies (Concentration Risk) (Details) Uncategorized 48 false false R49.htm 2403402 - Disclosure - Accounts Receivable (Narrative) (Details) Sheet http://www.oesx.com/role/AccountsReceivableNarrativeDetails Accounts Receivable (Narrative) (Details) Uncategorized 49 false false R50.htm 2403403 - Disclosure - (Accounts Receivable and Allowance for Doubtful Accounts) (Details) Sheet http://www.oesx.com/role/AccountsReceivableAndAllowanceForDoubtfulAccountsDetails (Accounts Receivable and Allowance for Doubtful Accounts) (Details) Uncategorized 50 false false R51.htm 2404402 - Disclosure - Financing Receivables (Aging Analysis) (Details) Sheet http://www.oesx.com/role/FinancingReceivablesAgingAnalysisDetails Financing Receivables (Aging Analysis) (Details) Uncategorized 51 false false R52.htm 2404403 - Disclosure - Financing Receivables (Allowance for Doubtful Accounts) (Details) Sheet http://www.oesx.com/role/FinancingReceivablesAllowanceForDoubtfulAccountsDetails Financing Receivables (Allowance for Doubtful Accounts) (Details) Uncategorized 52 false false R53.htm 2405402 - Disclosure - Inventories (Details) Sheet http://www.oesx.com/role/InventoriesDetails Inventories (Details) Uncategorized 53 false false R54.htm 2406402 - Disclosure - Prepaid Expenses and Other Current Assets (Details) Sheet http://www.oesx.com/role/PrepaidExpensesAndOtherCurrentAssetsDetails Prepaid Expenses and Other Current Assets (Details) Uncategorized 54 false false R55.htm 2407402 - Disclosure - Property and Equipment (Narrative) (Details) Sheet http://www.oesx.com/role/PropertyAndEquipmentNarrativeDetails Property and Equipment (Narrative) (Details) Uncategorized 55 false false R56.htm 2407403 - Disclosure - Property and Equipment (Summary of Property and Equipment) (Details) Sheet http://www.oesx.com/role/PropertyAndEquipmentSummaryOfPropertyAndEquipmentDetails Property and Equipment (Summary of Property and Equipment) (Details) Uncategorized 56 false false R57.htm 2407404 - Disclosure - Property and Equipment (Equipment under Capital Leases) (Details) Sheet http://www.oesx.com/role/PropertyAndEquipmentEquipmentUnderCapitalLeasesDetails Property and Equipment (Equipment under Capital Leases) (Details) Uncategorized 57 false false R58.htm 2407405 - Disclosure - Property and Equipment (Useful Lives) (Details) Sheet http://www.oesx.com/role/PropertyAndEquipmentUsefulLivesDetails Property and Equipment (Useful Lives) (Details) Uncategorized 58 false false R59.htm 2408402 - Disclosure - Goodwill and Other Intangible Assets (Narrative) (Details) Sheet http://www.oesx.com/role/GoodwillAndOtherIntangibleAssetsNarrativeDetails Goodwill and Other Intangible Assets (Narrative) (Details) Uncategorized 59 false false R60.htm 2408403 - Disclosure - Goodwill and Other Intangible Assets (Change in Carrying Value of Goodwill) (Details) Sheet http://www.oesx.com/role/GoodwillAndOtherIntangibleAssetsChangeInCarryingValueOfGoodwillDetails Goodwill and Other Intangible Assets (Change in Carrying Value of Goodwill) (Details) Uncategorized 60 false false R61.htm 2408404 - Disclosure - Goodwill and Other Intangible Assets (Useful Lives) (Details) Sheet http://www.oesx.com/role/GoodwillAndOtherIntangibleAssetsUsefulLivesDetails Goodwill and Other Intangible Assets (Useful Lives) (Details) Uncategorized 61 false false R62.htm 2408405 - Disclosure - Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) Sheet http://www.oesx.com/role/GoodwillAndOtherIntangibleAssetsOtherIntangibleAssetsDetails Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) Uncategorized 62 false false R63.htm 2408406 - Disclosure - Goodwill and Other Intangible Assets (Future Amortization by Fiscal Year) (Details) Sheet http://www.oesx.com/role/GoodwillAndOtherIntangibleAssetsFutureAmortizationByFiscalYearDetails Goodwill and Other Intangible Assets (Future Amortization by Fiscal Year) (Details) Uncategorized 63 false false R64.htm 2408407 - Disclosure - Goodwill and Other Intangible Assets (Amortization Expense) (Details) Sheet http://www.oesx.com/role/GoodwillAndOtherIntangibleAssetsAmortizationExpenseDetails Goodwill and Other Intangible Assets (Amortization Expense) (Details) Uncategorized 64 false false R65.htm 2409402 - Disclosure - Other Long-Term Assets (Summary of Other Long-Term Assets) (Details) Sheet http://www.oesx.com/role/OtherLongTermAssetsSummaryOfOtherLongTermAssetsDetails Other Long-Term Assets (Summary of Other Long-Term Assets) (Details) Uncategorized 65 false false R66.htm 2409403 - Disclosure - Other Long-Term Assets (Narrative) (Details) Sheet http://www.oesx.com/role/OtherLongTermAssetsNarrativeDetails Other Long-Term Assets (Narrative) (Details) Uncategorized 66 false false R67.htm 2410402 - Disclosure - Accrued Expenses and Other (Accrued Expenses and Other) (Details) Sheet http://www.oesx.com/role/AccruedExpensesAndOtherAccruedExpensesAndOtherDetails Accrued Expenses and Other (Accrued Expenses and Other) (Details) Uncategorized 67 false false R68.htm 2410403 - Disclosure - Accrued Expenses and Other (Narrative) (Details) Sheet http://www.oesx.com/role/AccruedExpensesAndOtherNarrativeDetails Accrued Expenses and Other (Narrative) (Details) Uncategorized 68 false false R69.htm 2410404 - Disclosure - Accrued Expenses and Other (Warranty Accrual) (Details) Sheet http://www.oesx.com/role/AccruedExpensesAndOtherWarrantyAccrualDetails Accrued Expenses and Other (Warranty Accrual) (Details) Uncategorized 69 false false R70.htm 2411402 - Disclosure - Net Income (Loss) per Common Share (Earnings per Share) (Details) Sheet http://www.oesx.com/role/NetIncomeLossPerCommonShareEarningsPerShareDetails Net Income (Loss) per Common Share (Earnings per Share) (Details) Uncategorized 70 false false R71.htm 2411403 - Disclosure - Net Income (Loss) per Common Share (Dilutive Securities) (Details) Sheet http://www.oesx.com/role/NetIncomeLossPerCommonShareDilutiveSecuritiesDetails Net Income (Loss) per Common Share (Dilutive Securities) (Details) Uncategorized 71 false false R72.htm 2412401 - Disclosure - Acquisition (Details) Sheet http://www.oesx.com/role/AcquisitionDetails Acquisition (Details) Uncategorized 72 false false R73.htm 2413401 - Disclosure - Related Party Transactions (Details) Sheet http://www.oesx.com/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) Uncategorized 73 false false R74.htm 2414402 - Disclosure - Long-Term Debt (Summary of Debt) (Details) Sheet http://www.oesx.com/role/LongTermDebtSummaryOfDebtDetails Long-Term Debt (Summary of Debt) (Details) Uncategorized 74 false false R75.htm 2414403 - Disclosure - Long-Term Debt (Revolving Credit Facility) (Details) Sheet http://www.oesx.com/role/LongTermDebtRevolvingCreditFacilityDetails Long-Term Debt (Revolving Credit Facility) (Details) Uncategorized 75 false false R76.htm 2414404 - Disclosure - Long-Term Debt (All Other Debt) (Details) Sheet http://www.oesx.com/role/LongTermDebtAllOtherDebtDetails Long-Term Debt (All Other Debt) (Details) Uncategorized 76 false false R77.htm 2414405 - Disclosure - Long-Term Debt (Aggregate Maturities) (Details) Sheet http://www.oesx.com/role/LongTermDebtAggregateMaturitiesDetails Long-Term Debt (Aggregate Maturities) (Details) Uncategorized 77 false false R78.htm 2415402 - Disclosure - Income Taxes (Schedule of Components of Income Tax Expense or Benefit) (Details) Sheet http://www.oesx.com/role/IncomeTaxesScheduleOfComponentsOfIncomeTaxExpenseOrBenefitDetails Income Taxes (Schedule of Components of Income Tax Expense or Benefit) (Details) Uncategorized 78 false false R79.htm 2415403 - Disclosure - Income Taxes (Reconciliation of tax rates) (Details) Sheet http://www.oesx.com/role/IncomeTaxesReconciliationOfTaxRatesDetails Income Taxes (Reconciliation of tax rates) (Details) Uncategorized 79 false false R80.htm 2415404 - Disclosure - Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) Sheet http://www.oesx.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) Uncategorized 80 false false R81.htm 2415405 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://www.oesx.com/role/IncomeTaxesNarrativeDetails Income Taxes (Narrative) (Details) Uncategorized 81 false false R82.htm 2415406 - Disclosure - Income Taxes (Unrecognized Tax Benefit Activity) (Details) Sheet http://www.oesx.com/role/IncomeTaxesUnrecognizedTaxBenefitActivityDetails Income Taxes (Unrecognized Tax Benefit Activity) (Details) Uncategorized 82 false false R83.htm 2416402 - Disclosure - Commitments and Contingencies (Narrative) (Details) Sheet http://www.oesx.com/role/CommitmentsAndContingenciesNarrativeDetails Commitments and Contingencies (Narrative) (Details) Uncategorized 83 false false R84.htm 2416403 - Disclosure - Commitments and Contingencies (Schedule of Annual Commitments under Non-Cancelable Operating Agreements) (Details) Sheet http://www.oesx.com/role/CommitmentsAndContingenciesScheduleOfAnnualCommitmentsUnderNonCancelableOperatingAgreementsDetails Commitments and Contingencies (Schedule of Annual Commitments under Non-Cancelable Operating Agreements) (Details) Uncategorized 84 false false R85.htm 2417402 - Disclosure - Shareholders' Equity (Narrative) (Details) Sheet http://www.oesx.com/role/ShareholdersEquityNarrativeDetails Shareholders' Equity (Narrative) (Details) Uncategorized 85 false false R86.htm 2417403 - Disclosure - Shareholders' Equity (Schedule of ESPP Activity) (Details) Sheet http://www.oesx.com/role/ShareholdersEquityScheduleOfEsppActivityDetails Shareholders' Equity (Schedule of ESPP Activity) (Details) Uncategorized 86 false false R87.htm 2418402 - Disclosure - Stock Options, Restricted Shares and Warrants (Narrative) (Details) Sheet http://www.oesx.com/role/StockOptionsRestrictedSharesAndWarrantsNarrativeDetails Stock Options, Restricted Shares and Warrants (Narrative) (Details) Uncategorized 87 false false R88.htm 2418403 - Disclosure - Stock Options, Restricted Shares and Warrants (Stock-based Compensation) (Details) Sheet http://www.oesx.com/role/StockOptionsRestrictedSharesAndWarrantsStockBasedCompensationDetails Stock Options, Restricted Shares and Warrants (Stock-based Compensation) (Details) Uncategorized 88 false false R89.htm 2418404 - Disclosure - Stock Options, Restricted Shares and Warrants (Schedule of Shares Available for Grant) (Details) Sheet http://www.oesx.com/role/StockOptionsRestrictedSharesAndWarrantsScheduleOfSharesAvailableForGrantDetails Stock Options, Restricted Shares and Warrants (Schedule of Shares Available for Grant) (Details) Uncategorized 89 false false R90.htm 2418405 - Disclosure - Stock Options, Restricted Shares and Warrants (Summary of Outstanding Stock Options) (Details) Sheet http://www.oesx.com/role/StockOptionsRestrictedSharesAndWarrantsSummaryOfOutstandingStockOptionsDetails Stock Options, Restricted Shares and Warrants (Summary of Outstanding Stock Options) (Details) Uncategorized 90 false false R91.htm 2418406 - Disclosure - Stock Options, Restricted Shares and Warrants (Summary of Exercise Price Range) (Details) Sheet http://www.oesx.com/role/StockOptionsRestrictedSharesAndWarrantsSummaryOfExercisePriceRangeDetails Stock Options, Restricted Shares and Warrants (Summary of Exercise Price Range) (Details) Uncategorized 91 false false R92.htm 2418407 - Disclosure - Stock Options, Restricted Shares and Warrants (Schedule of Restricted Shares) (Details) Sheet http://www.oesx.com/role/StockOptionsRestrictedSharesAndWarrantsScheduleOfRestrictedSharesDetails Stock Options, Restricted Shares and Warrants (Schedule of Restricted Shares) (Details) Uncategorized 92 false false R93.htm 2418408 - Disclosure - Stock Options, Restricted Shares and Warrants (Summary of Unrecognized Compensation Cost) (Details) Sheet http://www.oesx.com/role/StockOptionsRestrictedSharesAndWarrantsSummaryOfUnrecognizedCompensationCostDetails Stock Options, Restricted Shares and Warrants (Summary of Unrecognized Compensation Cost) (Details) Uncategorized 93 false false R94.htm 2419402 - Disclosure - Segment Data (Reconciliation of Segment Operations) (Details) Sheet http://www.oesx.com/role/SegmentDataReconciliationOfSegmentOperationsDetails Segment Data (Reconciliation of Segment Operations) (Details) Uncategorized 94 false false R95.htm 2419403 - Disclosure - Segment Data (Reconciliation of Segment Assets and Liabilities) (Details) Sheet http://www.oesx.com/role/SegmentDataReconciliationOfSegmentAssetsAndLiabilitiesDetails Segment Data (Reconciliation of Segment Assets and Liabilities) (Details) Uncategorized 95 false false R96.htm 2420401 - Disclosure - Subsequent Events (Details) Sheet http://www.oesx.com/role/SubsequentEventsDetails Subsequent Events (Details) Uncategorized 96 false false R97.htm 2421402 - Disclosure - Quarterly Financial Data (Details) Sheet http://www.oesx.com/role/QuarterlyFinancialDataDetails Quarterly Financial Data (Details) Uncategorized 97 false false R98.htm 2422401 - Schedule - Schedule II Valuation and Qualifying Accounts (Details) Sheet http://www.oesx.com/role/ScheduleIiValuationAndQualifyingAccountsDetails Schedule II Valuation and Qualifying Accounts (Details) Uncategorized 98 false false All Reports Book All Reports oesx-20170331.xml oesx-20170331.xsd oesx-20170331_cal.xml oesx-20170331_def.xml oesx-20170331_lab.xml oesx-20170331_pre.xml true true