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Significant Accounting Policies - Earnings Per Share (Details) (Out of Money)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 101,843us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 41,397us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Restricted stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     408,835us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementScenarioAxis
= xoxo_OutOfMoneyMember
Equity Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     219,315us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_StockOptionMember
/ us-gaap_StatementScenarioAxis
= xoxo_OutOfMoneyMember