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Lines of Credit and Long Term Debt - Components of Long Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt $ 10,369us-gaap_LongTermDebt $ 1,653us-gaap_LongTermDebt
Current portion of long term debt 1,675us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent
Long term debt, net of current portion 8,694us-gaap_LongTermDebtNoncurrent 1,653us-gaap_LongTermDebtNoncurrent
Notes payable    
Debt Instrument [Line Items]    
Long-term debt 7,653us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Royalty-based financing    
Debt Instrument [Line Items]    
Long-term debt 1,926us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= xon_RoyaltybasedFinancingMember		 1,653us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= xon_RoyaltybasedFinancingMember
Other    
Debt Instrument [Line Items]    
Long-term debt $ 790us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= xon_OtherLongTermDebtMember		 $ 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= xon_OtherLongTermDebtMember