Debt Financing (Details) (USD $) In Thousands, unless otherwise specified
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3 Months Ended |
6 Months Ended |
3 Months Ended |
1 Months Ended |
Mar. 29, 2015
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Mar. 29, 2015
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Mar. 30, 2014
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Dec. 28, 2014
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Nov. 17, 2014
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Debt Instrument [Line Items] |
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Derivative Value |
$ 0us-gaap_DerivativeLiabilitiesNoncurrent
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$ 0us-gaap_DerivativeLiabilitiesNoncurrent
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$ 6,127us-gaap_DerivativeLiabilitiesNoncurrent
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Change in Fair Value - Derivatives |
(847)us-gaap_UnrealizedGainLossOnDerivatives
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Convertible promissory note |
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Debt Instrument [Line Items] |
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Notes |
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1,560us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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Derivative Value |
0us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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0us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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6,127us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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Change in Fair Value - Derivatives |
847us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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(847)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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Convertible promissory note | Investors |
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Debt Instrument [Line Items] |
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Notes |
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1,550us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LineOfCreditFacilityAxis = opxs_InvestorsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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Derivative Value |
(6,929)us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LineOfCreditFacilityAxis = opxs_InvestorsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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(6,929)us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LineOfCreditFacilityAxis = opxs_InvestorsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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6,929us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LineOfCreditFacilityAxis = opxs_InvestorsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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6,929us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LineOfCreditFacilityAxis = opxs_InvestorsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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Change in Fair Value - Derivatives |
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Convertible promissory note | Brokers |
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Debt Instrument [Line Items] |
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Notes |
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10us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_LineOfCreditFacilityAxis = opxs_PlacementAgencyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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Derivative Value |
(45)us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LineOfCreditFacilityAxis = opxs_PlacementAgencyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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(45)us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LineOfCreditFacilityAxis = opxs_PlacementAgencyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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45us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LineOfCreditFacilityAxis = opxs_PlacementAgencyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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45us-gaap_DerivativeLiabilitiesNoncurrent / us-gaap_LineOfCreditFacilityAxis = opxs_PlacementAgencyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
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Change in Fair Value - Derivatives |
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