Income Taxes (Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets, Gross [Abstract]
Net operating loss and tax credit carry forwards	$ 88,656	$ 93,128
Inventory reserve and uniform capitalization	1,705	1,474
Stock options and warrants	2,704	2,440
Allowance for bad debts and sales returns	880	171
Vacation accrual	146	261
Deferred rent	126	143
Deferred revenue	433hill_DeferredTaxAssetsDeferredRevenue	380hill_DeferredTaxAssetsDeferredRevenue
Warranty accrual	1,173	958
Depreciation and amortization	1,137	1,358
Other accruals and reserves	433	362
Accrued Bonus	418	873
Intangible assets	1,037	1,195
Total deferred tax assets	98,848us-gaap_DeferredTaxAssetsGross	102,743us-gaap_DeferredTaxAssetsGross
Deferred Tax Liabilities, Gross [Abstract]
State taxes	(3,696)hill_DeferredTaxLiabilitiesStateTaxes	(3,885)hill_DeferredTaxLiabilitiesStateTaxes
Other	(187)us-gaap_DeferredTaxLiabilitiesOther	(548)us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities	(3,883)us-gaap_DeferredIncomeTaxLiabilities	(4,433)us-gaap_DeferredIncomeTaxLiabilities
Valuation allowance	(94,873)	(98,205)
Net deferred tax assets	$ 92us-gaap_DeferredTaxAssetsNet	$ 105us-gaap_DeferredTaxAssetsNet

Deferred Tax Assets, Deferred Revenue

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Deferred Tax Assets, Depreciation and Amortization

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Deferred Tax Assets, Inventory Reserve and Uniform Capitalization

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Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards

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Deferred Tax Liabilities, State Taxes

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Amount of deferred tax liability attributable to taxable temporary differences.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Deferred Tax Liability

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensated absences (includes, but not limited to, sick and personal days).

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee bonuses.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred rent.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves and accruals not separately disclosed.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the provision for loan losses.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from warranty reserves.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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