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v2.4.1.9

Summary of Significant Accounting Policies - Summarized Financial Data (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Operating expenses | $ 120,972 us-gaap_OperatingExpenses | $ 25,726 us-gaap_OperatingExpenses |
Equity Method Investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | 147,728 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |  | 63,627 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember
Non-current assets | 1,213 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |  | 1,259 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember
Total assets | 148,941 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |  | 64,886 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember
Current liabilities | 14,763 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |  | 15,346 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember
Non-current liabilities | 553 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |  | 570 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember
Total liabilities | 15,316 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |  | 15,916 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember
Net assets | 133,625 xon_EquityMethodInvestmentSummarizedFinancialInformationAssetsLiabilitiesNet / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |  | 48,970 xon_EquityMethodInvestmentSummarizedFinancialInformationAssetsLiabilitiesNet / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember
Revenues | 636 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember | 415 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |
Operating expenses | 84,069 us-gaap_OperatingExpenses / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember | 12,920 us-gaap_OperatingExpenses / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |
Loss from operations | (83,433)xon_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember | (12,505)xon_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |
Other | (1)xon_EquityMethodInvestmentSummarizedFinancialInformationOtherNonoperatingIncomeExpense / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember | 81 xon_EquityMethodInvestmentSummarizedFinancialInformationOtherNonoperatingIncomeExpense / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |
Net loss | $ (83,434)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember | $ (12,424)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / invest_InvestmentAxis = us-gaap_EquityMethodInvestmentsMember |

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