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Fair Value Measures and Disclosures Assets and Liabilities by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investment securities $ 14,661 $ 14,687 [1]
Long-term investment securities 15,670 12,974
Assets, Fair Value Disclosure 32,180 31,216
Earn-out liability [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Nonfinancial Liabilities Fair Value Disclosure 26,300 26,300
Liabilities, Total [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Nonfinancial Liabilities Fair Value Disclosure 26,300 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 1,849 3,555
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investment securities 0 0
Long-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] | 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]    
Short-term investment securities 14,661 14,687
Long-term investment securities 15,670 12,974
Assets, Fair Value Disclosure 32,180 31,216
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 0 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 1,849 3,555
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investment securities 0 0
Long-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 26,300 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 26,300 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.