Quarterly report pursuant to Section 13 or 15(d)

Debt Financing (Details)

v2.4.1.9
Debt Financing (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 1 Months Ended
Mar. 29, 2015
Mar. 29, 2015
Mar. 30, 2014
Dec. 28, 2014
Nov. 17, 2014
Debt Instrument [Line Items]          
Derivative Value $ 0us-gaap_DerivativeLiabilitiesNoncurrent $ 0us-gaap_DerivativeLiabilitiesNoncurrent   $ 6,127us-gaap_DerivativeLiabilitiesNoncurrent  
Change in Fair Value - Derivatives (847)us-gaap_UnrealizedGainLossOnDerivatives          
Convertible promissory note          
Debt Instrument [Line Items]          
Notes         1,560us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Derivative Value 0us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
0us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
  6,127us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Change in Fair Value - Derivatives 847us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
     (847)us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Convertible promissory note | Investors          
Debt Instrument [Line Items]          
Notes         1,550us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_LineOfCreditFacilityAxis
= opxs_InvestorsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Derivative Value (6,929)us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LineOfCreditFacilityAxis
= opxs_InvestorsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
(6,929)us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LineOfCreditFacilityAxis
= opxs_InvestorsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
  6,929us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LineOfCreditFacilityAxis
= opxs_InvestorsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
6,929us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LineOfCreditFacilityAxis
= opxs_InvestorsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Change in Fair Value - Derivatives           
Convertible promissory note | Brokers          
Debt Instrument [Line Items]          
Notes         10us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_LineOfCreditFacilityAxis
= opxs_PlacementAgencyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Derivative Value (45)us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LineOfCreditFacilityAxis
= opxs_PlacementAgencyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
(45)us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LineOfCreditFacilityAxis
= opxs_PlacementAgencyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
  45us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LineOfCreditFacilityAxis
= opxs_PlacementAgencyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
45us-gaap_DerivativeLiabilitiesNoncurrent
/ us-gaap_LineOfCreditFacilityAxis
= opxs_PlacementAgencyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Change in Fair Value - Derivatives