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Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Income taxes, prepaid Prepaid Taxes Denominator: Denominator [Abstract] Denominator [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Cash and Cash Equivalents and Marketable Securities [Table] Cash And Cash Equivalents And Marketable Securities [Table] N/A Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Investments Investment Securities Short-Term Investments Name Trading Arrangement, Individual Name Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Advertising expense Advertising Expense Cash and cash equivalents Cash & Cash Equivalents Cash and Cash Equivalent Operating lease expense Operating Lease, Expense Company Selected Measure Amount Company Selected Measure Amount Unrealized loss on equity investment securities Unrealized gains recognized during the reporting period on equity securities still held at the reporting date Equity Securities, FV-NI, Unrealized Gain (Loss) Depreciation and amortization Depreciation, Depletion and Amortization Schedule of Investment Losses Gain (Loss) on Securities [Table Text Block] Shares Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Current Assets Assets, Current [Abstract] Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Provision for income taxes Income Tax Expense (Benefit) Award Timing Method Award Timing Method [Text Block] Presentation of Financial Statements Consolidation, Policy [Policy Text Block] Increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net income (loss) Net income (loss) Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from stock options exercised Proceeds from Stock Options Exercised Schedule of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Interest income Investment Income, Interest Exercisable at end of the period (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]