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Fair Value Measurements (Summary of Valuation of Company's Financial Instruments by Various Levels) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | $ 117,902 |  | $ 165,237 |
Liabilities measured at fair value |  | 344 |  | 5,382 |
Quoted market prices in active markets (Level 1) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 116,006 |  | 163,422 |
Liabilities measured at fair value |  | 0 |  | 0 |
Significant other observable inputs (Level 2) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 1,896 |  | 489 |
Liabilities measured at fair value |  | 344 |  | 2,382 |
Significant unobservable inputs (Level 3) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 0 |  | 1,326 |
Liabilities measured at fair value |  | 0 |  | 3,000 |
Cash equivalents |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 108,441 |  | 158,054 |
Cash equivalents | Quoted market prices in active markets (Level 1) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 108,441 |  | 158,054 |
Cash equivalents | Significant other observable inputs (Level 2) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 0 |  | 0 |
Cash equivalents | Significant unobservable inputs (Level 3) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 0 |  | 0 |
Certificates of deposit |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 6 |  | 165 |
Certificates of deposit | Quoted market prices in active markets (Level 1) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 0 |  | 0 |
Certificates of deposit | Significant other observable inputs (Level 2) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 6 |  | 165 |
Certificates of deposit | Significant unobservable inputs (Level 3) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 0 |  | 0 |
Trading securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 6,814 |  | 5,368 |
Trading securities | Quoted market prices in active markets (Level 1) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 6,814 |  | 5,368 |
Trading securities | Significant other observable inputs (Level 2) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 0 |  | 0 |
Trading securities | Significant unobservable inputs (Level 3) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 0 |  | 0 |
Available-for-sale Investments, Convertible Debt Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 518 | [2] | 1,326 | [1]
Available-for-sale Investments, Convertible Debt Securities | Quoted market prices in active markets (Level 1) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 0 | [2] | 0 | [1]
Available-for-sale Investments, Convertible Debt Securities | Significant other observable inputs (Level 2) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 518 | [2] | 0 | [1]
Available-for-sale Investments, Convertible Debt Securities | Significant unobservable inputs (Level 3) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value |  | 0 | [2] | 1,326 | [1]
Corporate Equity Securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 751 |  |  |
Corporate Equity Securities | Quoted market prices in active markets (Level 1) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 751 |  |  |
Corporate Equity Securities | Significant other observable inputs (Level 2) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 0 |  |  |
Corporate Equity Securities | Significant unobservable inputs (Level 3) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [1] | 0 |  |  |
Contingent Consideration |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Liabilities measured at fair value | [3] |  |  | 3,000 |
Contingent Consideration | Quoted market prices in active markets (Level 1) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Liabilities measured at fair value | [3] |  |  | 0 |
Contingent Consideration | Significant other observable inputs (Level 2) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Liabilities measured at fair value | [3] |  |  | 0 |
Contingent Consideration | Significant unobservable inputs (Level 3) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Liabilities measured at fair value | [3] |  |  | 3,000 |
Foreign currency forward contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [4] | 1,372 |  | 324 |
Liabilities measured at fair value | [5] | 344 |  | 2,382 |
Foreign currency forward contracts | Quoted market prices in active markets (Level 1) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [4] | 0 |  | 0 |
Liabilities measured at fair value | [5] | 0 |  | 0 |
Foreign currency forward contracts | Significant other observable inputs (Level 2) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [4] | 1,372 |  | 324 |
Liabilities measured at fair value | [5] | 344 |  | 2,382 |
Foreign currency forward contracts | Significant unobservable inputs (Level 3) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets measured at fair value | [4] | 0 |  | 0 |
Liabilities measured at fair value | [5] | $ 0 |  | $ 0 |
[1] | Included in Short-term investments on the Company’s consolidated balance sheets
[2] | $172,000 and $346,000 included in Short-term investments and Other non-current assets on the Company’s consolidated balance sheets, respectively.
[3] | Included in Other non-current accrued liabilities on the Company’s consolidated balance sheets. The contingent consideration represented the estimated fair value of the additional variable cash consideration payable in connection with the acquisition of Meural in August 2018 that was contingent upon the achievement of certain technical and service revenue milestones.
[4] | Included in Prepaid expenses and other current assets on the Company’s consolidated balance sheets.
[5] | Included in Other accrued liabilities on the Company’s consolidated balance sheets.

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