Fair Value Measures and Disclosures Assets and Liabilities by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	$ 25,953	$ 31,216
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	18,009	14,687	[1]
Debt Securities, Available-for-sale, Noncurrent	7,172	12,974
Earn-out liability [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Nonfinancial Liabilities Fair Value Disclosure	29,400	26,300
Liabilities, Total [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Nonfinancial Liabilities Fair Value Disclosure	29,400	26,300
Prepaid Expenses and Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign Currency Contract, Asset, Fair Value Disclosure	772	3,555
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	0	0
Debt Securities, Available-for-sale, Noncurrent	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] | 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	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	25,953	31,216
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	18,009	14,687
Debt Securities, Available-for-sale, Noncurrent	7,172	12,974
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	26,300	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	26,300	0
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	772	3,555
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0	0
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	0	0
Debt Securities, Available-for-sale, Noncurrent	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	3,100	26,300
Fair Value, Inputs, Level 3 [Member] | Liabilities, Total [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Nonfinancial Liabilities Fair Value Disclosure	3,100	26,300
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	$ 0

[1] December 31, 2020 balances were derived from audited consolidated financial statements.