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Continuing Operations Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Product and Service [Axis] Product and Service [Axis] Financial Instrument [Axis] Financial Instrument [Axis] Repayments on term loan Repayments of Secured Debt Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Other accounts receivable Other Receivables, Net, Current Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Current liabilities: Liabilities, Current [Abstract] Deferred costs, non-current Deferred Costs, Noncurrent Marketable securities, unrealized gain Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Number of options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Annual minimum commitments OtherCommitmentsFutureMinimumAnnualPayments Weighted-average grant date fair value, beginning balance (in usd per share) Weighted-average grant date fair value, ending balance (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Credit Facility [Domain] Credit Facility [Domain] Money market account Money Market Funds [Member] Income Taxes Income Tax Disclosure [Text Block] Republic RepublicMember 2021 Operating Leases, Future Minimum Payments, Due in Four Years Term of lease (in months) Lessee, Operating Lease, Term of Contract Segment Reporting [Abstract] Statement of Cash Flows [Abstract] Marketable securities, net unrealized losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Goodwill and Intangible Assets Disclosure [Abstract] Computer and office equipment ComputerandOfficeEquipmentMember Class of Stock [Axis] Class of Stock [Axis] Depreciation Expense [Line Items] Depreciation Expense [Line Items] [Line Items] for Depreciation Expense [Table] Related Party [Domain] Related Party [Domain] Earnings Per Share [Abstract] Deferred costs Increase (Decrease) in Deferred Charges Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Weighted-average exercise price, exercised (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Subsequent Event [Line Items] Subsequent Event [Line Items] Minimum Minimum [Member] Retirement Benefits [Abstract] Concentration risk percentage Concentration Risk, Percentage Current assets: Assets, Current [Abstract] Awards outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Reduction of rent expense Rental payments received Operating Leases, Income Statement, Sublease Revenue Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Non-compete agreements Noncompete Agreements [Member] Revenue Revenues Revenue from related parties Revenue from Related Parties Other liabilities Other Liabilities, Noncurrent 2019 Operating Leases, Future Minimum Payments Receivable, in Two Years Gross profit Gross Profit Basic and Diluted Income per Common Share Earnings Per Share [Text Block] Class of Stock [Domain] Class of Stock [Domain] Telecommunications equipment TelecommunicationsEquipmentMember Write-off of previously outstanding and fully reserved billings related to settlement Write-off of previously outstanding and fully reserved billings related to settlement AllowanceforDoubtfulAccountsReceivableWriteoffsRelatedtoSettlements Unrecognized compensation cost related to non-vested RSUs Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Maximum Maximum [Member] Line of credit Long-term Line of Credit