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.