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Short Term Debt - Short Term Debt Interest (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Interest paid in cash      
Amortization of the RMB Warrants discount      
Amortization of RMB deferred financing costs      
Total interest expense 169us-gaap_InterestExpenseDebt 153us-gaap_InterestExpenseDebt
RMB Interest    
Interest paid in cash   46us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_ShortTermDebtTypeAxis
= XPL_RMBInterestMember
Amortization of the RMB Warrants discount   54us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_ShortTermDebtTypeAxis
= XPL_RMBInterestMember
Amortization of RMB deferred financing costs   49us-gaap_AmortizationOfDeferredCharges
/ us-gaap_ShortTermDebtTypeAxis
= XPL_RMBInterestMember
Total interest expense     
UBS Interest    
Interest paid in cash   4us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_ShortTermDebtTypeAxis
= XPL_UBSInterestMember
Amortization of the RMB Warrants discount     
Amortization of RMB deferred financing costs     
Total interest expense     
RMB Interest    
Interest paid in cash 66us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= XPL_RMBInterestMember		  
Amortization of the RMB Warrants discount 54us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_DebtInstrumentAxis
= XPL_RMBInterestMember		  
Amortization of RMB deferred financing costs 49us-gaap_AmortizationOfDeferredCharges
/ us-gaap_DebtInstrumentAxis
= XPL_RMBInterestMember		  
Total interest expense     
UBS Interest    
Interest paid in cash     
Amortization of the RMB Warrants discount     
Amortization of RMB deferred financing costs     
Total interest expense