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Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Change in accounting principle, accounting standards update, adopted Operating Lease, Liability, Noncurrent Operating lease liabilities, net of current portion Contract with Customer, Liability, Revenue Recognized Recognition of deferred revenue Intangible Asset, Finite-Lived [Table Text Block] Schedule of Intangible Assets Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Marketable securities continuous loss position for less than 12 months, estimated fair value Additional Paid in Capital, Common Stock Additional paid-in capital Additional paid in capital Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock, Ending Balance Security Exchange Name Security Exchange Name New Accounting Pronouncements, Policy [Policy Text Block] Recently Issued Accounting Standards Not Yet Adopted Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Entity Address, State or Province Entity Address, State or Province Related Party Transaction, Amounts of Transaction Prepaid amount for goods and services Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Amendment Flag Amendment Flag Goodwill [Table Text Block] Schedule of Goodwill Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Lease liabilities arising from obtaining ROU Assets Share-Based Payment Arrangement [Text Block] Stock-Based Awards Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Numerator: Interest Expense, Debt Total interest expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Convertible senior notes due two thousand twenty seven. Convertible Senior Notes Due Two Thousand Twenty Seven [Member] 2021 Convertible Senior Notes due 2027 2021 Notes Other Nonoperating Income (Expense) Other Nonoperating Income (Expense), Total Other income, net City Area Code City Area Code Increase (decrease) in operating lease right-of-use assets. Increase Decrease In Operating Lease Right Of Use Assets Operating lease right-of-use assets Operating Expenses [Abstract] Operating expenses: Inventory Disclosure [Text Block] Inventory Accrued Employee Benefits, Current Accrued compensation and employee related benefits Common Stock, Par or Stated Value Per Share Common stock, par value Cash and Cash Equivalents [Abstract] Cash and cash equivalents Liabilities, Current Total current liabilities Systems. Systems [Member] Systems Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation End of period Beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Short-Term Debt [Member] Short-term Debt Segment Reporting [Text Block] Segment Information Trading Symbol Trading Symbol Amortization of debt issuance costs Amortization of Debt Issuance Costs and Discounts Amortization of Debt Issuance Costs and Discounts, Total Total shares granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Number of Underlying Shares, Granted Entity Emerging Growth Company Entity Emerging Growth Company Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Foreign currency translation adjustment Additional Paid-in Capital [Member] Additional Paid-In-Capital Long-Term Debt, Gross Principal Amount Debt instrument, accrued interest noncurrent. Debt Instrument Accrued Interest Noncurrent Accrued interest US Treasury Securities [Member] Treasury Bill U.S. Treasury Securities Employee stock purchase plan shares. Employee Stock Purchase Plan Shares [Member] Employee Stock Purchase Plan Shares Cover [Abstract] Debt Instrument, Convertible, Number of Equity Instruments Number of Shares (in millions) Payments to Acquire Investments Purchases of investments Payments to Acquire Investments, Total Long-term Debt, Type Long-Term Debt, Type [Domain] Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive income Debt instrument convertible common stock conversion shares per 1000 principal amount of notes. Debt Instrument Convertible Common Stock Conversion Shares Per1000 Principal Amount Of Notes Initial Conversion Rate per $1,000 Principal Intangible Asset, Finite-Lived, Amortization Expense Amortization of intangible assets Amortization of intangibles Stock Issued During Period, Value, Acquisitions Common stock issued for Voyantic acquisition Share-Based Payment Arrangement, Noncash Expense Stock-based compensation Share-based Payment Arrangement, Noncash Expense, Total Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Short-Term Investments Short-term investments Short-term Investments, Total Fair Value Disclosures [Abstract] Cash and Cash Equivalent Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Ending Balance Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash provided by (used in) financing activities Two thousand nineteen note repurchase. Two Thousand Nineteen Note Repurchase [Member] 2019 Note Repurchase Entity Filer Category Entity Filer Category Induced Conversion of Convertible Debt Expense Induced conversion expense related to convertible notes Induced conversion expense Increase (Decrease) in Accounts Receivable Accounts receivable Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One 2027 Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Property and equipment, net Property, Plant and Equipment, Net, Total Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Patents [Member] Patent Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Marketable securities continuous loss position for greater than 12 months, estimated fair value Revenue from Contract with Customer, Excluding Assessed Tax Revenue Total revenue Revenue from Contract with Customer, Excluding Assessed Tax, Total Shares, Outstanding Ending balance, shares Beginning balance, shares Inventory Disclosure [Abstract] Segment Reporting [Abstract] Cash interest expense. Cash Interest Expense Cash interest expense Entity Address, Postal Zip Code Entity Address, Postal Zip Code Statement of Financial Position [Abstract] Local Phone Number Local Phone Number