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Long Term Debt - Summary RMB Loan (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
RMB Loan Borrowing |  |
Beginning balance | $ 1,500,000 |
Initial borrowing August 21, 2013 |  | 1,500,000
Borrowing | 2,000,000 |
Amortization of discount to interest cost |  |
Ending balance | 3,500,000 | 1,500,000
RMB Warrant Discount |  |
Beginning balance | (573,000) |
Initial borrowing August 21, 2013 |  | (650,000)
Borrowing |  |
Amortization of discount to interest cost | 217,000 | 77,000
Ending balance | (356,000) | (573,000)
RMB Long Term Debt |  |
Beginning balance | 927,000 |
Initial borrowing August 21, 2013 |  | 850,000
Borrowing | 2,000,000 |
Amortization of discount to interest cost | 217,000 | 77,000
Ending balance | $ 3,144,000 | $ 927,000

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_AmortizationDiscountToInterestCostRMBLoan
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_BalanceRMBLoan
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_BorrowingRMBLoan
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_InitialBorrowingRMBLoan
Namespace Prefix: | XPL_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration