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Derivative Instruments - Adjustment of fair values liability (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Beginning balance, Warrant Liability	$ 140us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet	$ 1,138us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Life (in months)	8 months	20 months	32 months
Beginning balance, Stock price Per Share	$ 0.85XPL_FairValueNetDerivativeLiabilityPricePerShareBeginning	$ 1.68XPL_FairValueNetDerivativeLiabilityPricePerShareBeginning
Volatility (%)	57.00%us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherFairValueVolatilityRate	55.00%us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherFairValueVolatilityRate	62.00%us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherFairValueVolatilityRate
Beginning balance, Risk-Free interest rate	38.00%XPL_FairValueNetDerivativeLiabilityRiskFreeInterestRateBegin	35.00%XPL_FairValueNetDerivativeLiabilityRiskFreeInterestRateBegin
Loss (gain) on warrant liability	(85)us-gaap_GainLossOnDerivativeInstrumentsNetPretax	(998)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Ending balance, Warrant Liability	$ 55us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet	$ 140us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet	$ 1,138us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Ending balance, Stock price Per Share	$ 0.92XPL_FairValueNetDerivativeLiabilityPricePerShareEnding	$ 0.85XPL_FairValueNetDerivativeLiabilityPricePerShareEnding	$ 1.68XPL_FairValueNetDerivativeLiabilityPricePerShareEnding
Ending balance, Risk-Free interest rate	19.00%XPL_FairValueNetDerivativeLiabilityRiskFreeInterestRateEnd	38.00%XPL_FairValueNetDerivativeLiabilityRiskFreeInterestRateEnd	35.00%XPL_FairValueNetDerivativeLiabilityRiskFreeInterestRateEnd

X

- Definition

This item represents the volatility of the security's fair value, represented as a percentage, which was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

+ Details

Name:	us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherFairValueVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

+ Details

Name:	us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

+ Details

Name:	us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Fair value price per share derivative liability, beginning balance.

+ References

No definition available.

+ Details

Name:	XPL_FairValueNetDerivativeLiabilityPricePerShareBeginning
Namespace Prefix:	XPL_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value price per share derivative liability, ending balance.

+ References

No definition available.

+ Details

Name:	XPL_FairValueNetDerivativeLiabilityPricePerShareEnding
Namespace Prefix:	XPL_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Risk-free interest rate derivative liability, beginning rate.

+ References

No definition available.

+ Details

Name:	XPL_FairValueNetDerivativeLiabilityRiskFreeInterestRateBegin
Namespace Prefix:	XPL_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Risk-free interest rate derivative liability, ending rate.

+ References

No definition available.

+ Details

Name:	XPL_FairValueNetDerivativeLiabilityRiskFreeInterestRateEnd
Namespace Prefix:	XPL_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration