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COMMITMENTS AND CONTINGENCIES. (Details 2) (USD $)
0 Months Ended
Oct. 25, 2011
Ownership Transaction Incentive Plan  
Share price used in calculation for certain shareholder payments, disclosed as an example, under the Ownership Transaction Incentive Plan (in dollars per share) $ 9.00sts_ChangeOfControlIncentivePlanSalesPriceForCertainShareholderPaymentsExample
Share price calculated for certain shareholder payments, disclosed as an example, under the Ownership Transaction Incentive Plan (in dollars per share) $ 0.52sts_ChangeOfControlIncentivePlanCalculatedPricePerShareForCertainShareholderPaymentsExample
Forfeiture period for participant's right to receive a percentage of the aggregate amount under the Ownership Transaction Incentive Plan if terminated without cause 6 months
Any Value above $2.50 and up to $5.00  
Ownership Transaction Incentive Plan  
Multiplier applied in the calculation of certain shareholder payments under the Ownership Transaction Incentive Plan 7.00%sts_ChangeOfControlIncentivePlanMultiplierUsedInCalculationOfCertainShareholderPayments
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdOneMember
Share price used in the calculation of certain shareholder payments, disclosed as an example, under the Ownership Transaction Incentive Plan (in dollars per share) $ 2.50sts_ChangeOfControlIncentivePlanSharePriceUsedInCalculationOfCertainShareholderPaymentsExample
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdOneMember
Any Value above $2.50 and up to $5.00 | Maximum  
Ownership Transaction Incentive Plan  
Share price threshold used in the calculation of certain shareholder payments under the Ownership Transaction Incentive Plan $ 5.00sts_ChangeOfControlIncentivePlanSharePriceThresholdUsedInCalculationOfCertainShareholderPayments
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Any Value above $2.50 and up to $5.00 | Minimum  
Ownership Transaction Incentive Plan  
Share price threshold used in the calculation of certain shareholder payments under the Ownership Transaction Incentive Plan $ 2.50sts_ChangeOfControlIncentivePlanSharePriceThresholdUsedInCalculationOfCertainShareholderPayments
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdOneMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Any Value above $5.00 and up to $7.00  
Ownership Transaction Incentive Plan  
Multiplier applied in the calculation of certain shareholder payments under the Ownership Transaction Incentive Plan 8.00%sts_ChangeOfControlIncentivePlanMultiplierUsedInCalculationOfCertainShareholderPayments
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdTwoMember
Share price used in the calculation of certain shareholder payments, disclosed as an example, under the Ownership Transaction Incentive Plan (in dollars per share) $ 2.00sts_ChangeOfControlIncentivePlanSharePriceUsedInCalculationOfCertainShareholderPaymentsExample
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdTwoMember
Any Value above $5.00 and up to $7.00 | Maximum  
Ownership Transaction Incentive Plan  
Share price threshold used in the calculation of certain shareholder payments under the Ownership Transaction Incentive Plan $ 7.00sts_ChangeOfControlIncentivePlanSharePriceThresholdUsedInCalculationOfCertainShareholderPayments
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdTwoMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Any Value above $5.00 and up to $7.00 | Minimum  
Ownership Transaction Incentive Plan  
Share price threshold used in the calculation of certain shareholder payments under the Ownership Transaction Incentive Plan $ 5.00sts_ChangeOfControlIncentivePlanSharePriceThresholdUsedInCalculationOfCertainShareholderPayments
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdTwoMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Any Value above $7.00  
Ownership Transaction Incentive Plan  
Multiplier applied in the calculation of certain shareholder payments under the Ownership Transaction Incentive Plan 9.00%sts_ChangeOfControlIncentivePlanMultiplierUsedInCalculationOfCertainShareholderPayments
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdThreeMember
Share price used in the calculation of certain shareholder payments, disclosed as an example, under the Ownership Transaction Incentive Plan (in dollars per share) $ 2.00sts_ChangeOfControlIncentivePlanSharePriceUsedInCalculationOfCertainShareholderPaymentsExample
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdThreeMember
Any Value above $7.00 | Minimum  
Ownership Transaction Incentive Plan  
Share price threshold used in the calculation of certain shareholder payments under the Ownership Transaction Incentive Plan $ 7.00sts_ChangeOfControlIncentivePlanSharePriceThresholdUsedInCalculationOfCertainShareholderPayments
/ sts_ChangeOfControlIncentivePlanSharePriceThresholdAxis
= sts_ChangeOfControlIncentivePlanSharePriceThresholdThreeMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember