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Retirement Plans - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employer contribution for first 3% of employee contributions	100.00%soho_PercentageOfMatchingContributionForFirstSpecifiedPercentageOfEmployeeContribution
Employer contribution for next 2% of employee contributions	50.00%soho_PercentageOfMatchingContributionForNextSpecifiedPercentageOfEmployeeContribution
Percentage of first specified employee contributions	3.00%soho_PercentageOfFirstSpecifiedPercentageOfEmployeeContribution
Percentage of next specified employee contributions	2.00%soho_PercentageOfNextSpecifiedPercentageOfEmployeeContribution
Contribution for retirement plan	$ 12,787us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 10,087us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

X

- Definition

Percentage of first specified percentage of employee contribution.

+ References

No definition available.

+ Details

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Namespace Prefix:	soho_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of matching contribution for first specified percentage of employee contribution.

+ References

No definition available.

+ Details

Name:	soho_PercentageOfMatchingContributionForFirstSpecifiedPercentageOfEmployeeContribution
Namespace Prefix:	soho_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of matching contribution for next specified percentage of employee contribution.

+ References

No definition available.

+ Details

Name:	soho_PercentageOfMatchingContributionForNextSpecifiedPercentageOfEmployeeContribution
Namespace Prefix:	soho_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of next specified percentage of employee contribution.

+ References

No definition available.

+ Details

Name:	soho_PercentageOfNextSpecifiedPercentageOfEmployeeContribution
Namespace Prefix:	soho_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration