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Fair Value Measures and Disclosures Assets and Liabilities by Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Short-term investment securities | $ 12,544 | $ 23,967 | [1]
Assets, Fair Value Disclosure | 13,850 | 26,333 |
Earn-out liability [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Nonfinancial Liabilities Fair Value Disclosure | 24,300 | 17,300 |
Liabilities, Total [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Nonfinancial Liabilities Fair Value Disclosure | 24,306 | 17,300 |
Other Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 216 |  |
Accrued Liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 6 |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure |  | 2,366 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Short-term investment securities | 0 | 0 |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Earn-out liability [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Nonfinancial Liabilities Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Liabilities, Total [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Nonfinancial Liabilities Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Other Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Accrued Liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure |  | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Short-term investment securities | 12,544 | 23,967 |
Assets, Fair Value Disclosure | 13,850 | 26,333 |
Fair Value, Inputs, Level 2 [Member] | Earn-out liability [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Nonfinancial Liabilities Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Liabilities, Total [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Nonfinancial Liabilities Fair Value Disclosure | 6 | 0 |
Fair Value, Inputs, Level 2 [Member] | Other Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 216 |  |
Fair Value, Inputs, Level 2 [Member] | Accrued Liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 6 |  |
Fair Value, Inputs, Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure |  | 2,366 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Short-term investment securities | 0 | 0 |
Assets, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Earn-out liability [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Nonfinancial Liabilities Fair Value Disclosure | 24,300 | 17,300 |
Fair Value, Inputs, Level 3 [Member] | Liabilities, Total [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Nonfinancial Liabilities Fair Value Disclosure | 24,300 | 17,300 |
Fair Value, Inputs, Level 3 [Member] | Other Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Accrued Liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | $ 0 |  |
Fair Value, Inputs, Level 3 [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure |  | $ 0 |
[1] | December 31, 2019 balances were derived from audited consolidated financial statements.

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