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Lines of Credit and Long Term Debt - Components of Long Term Debt (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Debt Instrument [Line Items] |  |
Long-term debt | $ 9,726 us-gaap_LongTermDebt | $ 10,369 us-gaap_LongTermDebt
Current portion of long term debt | 1,426 us-gaap_LongTermDebtCurrent | 1,675 us-gaap_LongTermDebtCurrent
Long term debt, net of current portion | 8,300 us-gaap_LongTermDebtNoncurrent | 8,694 us-gaap_LongTermDebtNoncurrent
Notes payable |  |
Debt Instrument [Line Items] |  |
Long-term debt | 7,360 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 7,653 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Royalty-based financing |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,868 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = xon_RoyaltybasedFinancingMember | 1,926 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = xon_RoyaltybasedFinancingMember
Other |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 498 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = xon_OtherLongTermDebtMember | $ 790 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = xon_OtherLongTermDebtMember

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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