Accrued Expenses and Other Current Liabilities [Abstract] Accrued Expenses and Other Current Liabilities [Abstract] Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Statement, Scenario [Axis] Statement, Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Net Income (Loss) Attributable to Parent Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Provision for doubtful accounts Provision for Doubtful Accounts Depreciation and amortization Depreciation, Depletion and Amortization Payment-in-kind interest added to long-term borrowings Paid-in-Kind Interest Loss on debt extinguishment Gains (Losses) on Extinguishment of Debt Deferred income taxes Increase (Decrease) in Deferred Income Taxes Other Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Other receivables Increase (Decrease) in Other Receivables Inventories Increase (Decrease) in Inventories Prepaid expenses Increase (Decrease) in Prepaid Expense Income tax receivable Increase (Decrease) in Income Taxes Receivable Other assets Increase (Decrease) in Other Operating Assets Accounts payable, accrued expenses and other current liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Accrued interest Increase (Decrease) in Interest Payable, Net Deferred revenue Increase (Decrease) in Deferred Revenue Other long-term liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Cash paid for asset purchases Payments to Acquire Businesses, Net of Cash Acquired Deposits to restricted cash Increase in Restricted Cash Increase in Restricted Cash Withdrawals from restricted cash Decrease in Restricted Cash Decrease in Restricted Cash Identifiable intangible assets associated with equipment purchases Payments to Acquire Intangible Assets Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Payments of other liabilities Repayments of Other Debt Payments on capital leases Repayments of Long-term Capital Lease Obligations Retirement of long-term borrowing Repayments of Long-term Debt Proceeds from long-term borrowing Proceeds from Issuance of Long-term Debt Prepayment premium on long-term borrowing Payments of Debt Extinguishment Costs Debt issue costs Payments of Debt Issuance Costs Net proceeds from stock option exercise Proceeds from Stock Options Exercised Repurchase Series A convertible redeemable preferred stock Payments for Repurchase of Redeemable Convertible Preferred Stock Payments of dividends on redeemable preferred stock Payments of Dividends, Preferred Stock and Preference Stock Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Supplemental disclosures of noncash investing and financing activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Property and equipment acquired through capital leases Fair Value of Assets Acquired Property and equipment unpaid and included in accounts payable, accrued expenses and other current liabilities Capital Expenditures Incurred but Not yet Paid Contingent consideration related to asset purchases Contingent consideration related to asset purchases Contingent consideration related to asset purchases Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid Income taxes paid Income Taxes Paid Series A Convertible Redeemable Preferred Stock [Abstract] Series A Convertible Redeemable Preferred Stock [Abstract] Series A Convertible Redeemable Preferred Stock [Text Block] Preferred Stock [Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, net Accounts Receivable, Net, Current Other receivables Other Receivables Income taxes receivable Income Taxes Receivable, Current Inventories Inventory, Net Prepaid expenses Prepaid Expense, Current Deferred tax assets, net Deferred Tax Assets, Net, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Intangible assets (less accumulated amortization of $13,356 in 2011 and $9,600 in 2010) Intangible Assets, Net (Excluding Goodwill) Restricted cash Restricted Cash and Cash Equivalents, Noncurrent Other assets, including debt issue costs Other Assets, Noncurrent Total assets Assets Liabilities and Stockholders' Deficiency Liabilities and Equity [Abstract] Current liabilities: Liabilities [Abstract] Accounts payable Accounts Payable, Current Accrued expenses and other current liabilities Accrued Liabilities, Current Accrued interest Interest Payable, Current Deferred revenue Deferred Revenue, Current Current portion of long-term debt Debt, Current Total current liabilities Liabilities, Current Deferred tax liabilities, net Deferred Tax Liabilities, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent Long-term debt, less current portion Long-term Debt, Excluding Current Maturities Series A convertible redeemable preferred stock, stated value $20 per share, 1,000,000 shares authorized, 141,324 and 239,496 shares issued and outstanding at December 31, 2011 and 2010, respectively Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent Commitments and contingencies (Notes 11 and 15) Commitments and Contingencies Stockholders' deficiency: Stockholders' Equity Attributable to Parent [Abstract] Common stock, par value $.0001 per share, 50,000,000 shares authorized, 25,907,310 and 25,616,103 shares issued and outstanding at December 31, 2011 and 2010, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders' deficiency Stockholders' Equity Attributable to Parent Total liabilities and stockholders' deficiency Liabilities and Equity Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets Intangible Assets Disclosure [Text Block] Consolidated Statements of Changes in Stockholders’ Deficiency [Abstract] Consolidated Statements of Changes in Stockholders’ Deficiency [Abstract] Statement, Equity Components [Axis] Statement, Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Deficit Retained Earnings [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of year (shares) Common Stock, Shares, Outstanding Balance, beginning of year Restricted stock awards released (shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Proceeds from exercise of stock options (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Proceeds frome exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Non-cash stock compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Repurchase redeemable preferred stock Adjustments to Additional Paid in Capital, Other Accrued dividends on redeemable preferred stock Dividends, Preferred Stock Balance, end of year (shares) Balance, end of year Accounts Receivable [Abstract] Accounts Receivable [Abstract] Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Lease Commitments [Abstract] Lease Commitments [Abstract] Lease Commitments Disclosure [Text Block] Commitments Disclosure [Text Block] Insurance Coverage [Abstract] Insurance Coverage [Abstract] Compensation Related Costs, General [Text Block] Insurance Coverage [Text Block] Insurance Coverage [Text Block] Business Combinations [Abstract] Equipment And Asset Purchases Business Combination Disclosure [Text Block] Income Statement [Abstract] Net revenues Revenues Costs and expenses: Costs and Expenses [Abstract] Product and supply costs Cost of Services, Direct Materials Patient service equipment depreciation Cost of Services, Depreciation and Amortization Operating expenses Operating Expenses Total cost of net revenues Cost of Revenue Selling, general and administrative Selling, General and Administrative Expense Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Total costs and expenses Costs and Expenses Operating income Operating Income (Loss) Other expense (income): Nonoperating Income (Expense) [Abstract] Interest expense, net Interest Expense Other income, net Other Nonoperating Income (Expense) Total other expense Nonoperating Income (Expense) Loss before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax benefit Income Tax Expense (Benefit) Net loss Accrued dividends on redeemable preferred stock Preferred Stock Dividends, Income Statement Impact Net loss attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Net loss per common share: Earnings Per Share [Abstract] Basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic and diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Certain Significant Risks And Uncertainties And Significant Events [Abstract] Certain Significant Risks and Uncertainties and Significant Events [Abstract] Certain Significant Risks And Uncertainties Certain Significant Risks and Uncertainties and Significant Events [TextBlock] Certain Significant Risks and Uncertainties and Significant Events [TextBlock] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis Of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Restricted Cash [Abstract] Restricted Cash [Abstract] Restricted Assets Disclosure [Text Block] Restricted Assets Disclosure [Text Block] Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Significant Accounting Policies [Text Block] Revenue Data and Concentration of Credit Risk [Abstract] Revenue Data and Concentration of Credit Risk [Abstract] Revenue Data and Concentration of Credit Risk Disclosure [Text Block] Concentration Risk Disclosure [Text Block] Employee Benefit Plans [Abstract] Employee Benefit Plans [Abstract] Employee Benefit Plans [Text Block] Compensation and Employee Benefit Plans [Text Block] Liquidity Liquidity [Text Block] Liquidity [Text Block] Debt Disclosure [Abstract] Debt Long-term Debt [Text Block] Property and Equipment [Abstract] Property and Equipment [Abstract] Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment Disclosure [Text Block] Other Assets [Abstract] Other Assets Disclosure [Text Block] Other Assets Disclosure [Text Block] Share-Based Compensation and Earnings Per Common Share Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Valuation and Qualifying Accounts [Abstract] Schedule of Valuation and Qualifying Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document And Entity Information [Abstract] [Abstract] Document And Entity Information [Abstract] [Abstract] Document and Entity Information (Abstract) Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Statement of Financial Position [Abstract] Intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Preferred stock, stated value Mandatorily Redeemable Preferred Stock Stated Value Mandatorily redeemable preferred stock stated value. Preferred stock, shares authorized Mandatorily Redeemable Preferred Stock, Shares Authorized Mandatorily redeemable preferred stock, shares authorized. Preferred stock, shares issued Mandatorily Redeemable Preferred Stock, Shares issued Mandatorily redeemable preferred stock, shares issued. Preferred stock, shares outstanding Mandatorily Redeemable Preferred Stock, Shares outstanding Mandatorily redeemable preferred stock, shares outstanding. Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding